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Plural of Thesis

What is the plural of thesis.

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The standard rules for forming the plurals, why is there confusion over the plural of thesis.

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plural of thesis

Type Example of Type Forming the Plural Plural
Most Nouns add s
Noun Ending s, sh, ch, x or z add es
Nouns ending [consonant] o add either s or es
(There are no rules for this - you have to know.)
Nouns ending [vowel] o add s
Nouns ending [consonant] y change the y to an i and add es
Nouns ending [vowel] y add s
Nouns ending f or fe ves and/or s
(There are no rules - you have to know.)
Nouns ending is
change the "is" to "es"
Exceptions some nouns undergo a vowel or letters change
More exceptions some nouns do not change at all
Foreign rulings some nouns adopt foreign rulings

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Definition of thesis

Did you know.

In high school, college, or graduate school, students often have to write a thesis on a topic in their major field of study. In many fields, a final thesis is the biggest challenge involved in getting a master's degree, and the same is true for students studying for a Ph.D. (a Ph.D. thesis is often called a dissertation ). But a thesis may also be an idea; so in the course of the paper the student may put forth several theses (notice the plural form) and attempt to prove them.

Examples of thesis in a Sentence

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'thesis.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

in sense 3, Middle English, lowering of the voice, from Late Latin & Greek; Late Latin, from Greek, downbeat, more important part of a foot, literally, act of laying down; in other senses, Latin, from Greek, literally, act of laying down, from tithenai to put, lay down — more at do

14th century, in the meaning defined at sense 3a(1)

Dictionary Entries Near thesis

the sins of the fathers are visited upon the children

thesis novel

Cite this Entry

“Thesis.” Merriam-Webster.com Dictionary , Merriam-Webster, https://www.merriam-webster.com/dictionary/thesis. Accessed 30 Jun. 2024.

Kids Definition

Kids definition of thesis, more from merriam-webster on thesis.

Nglish: Translation of thesis for Spanish Speakers

Britannica English: Translation of thesis for Arabic Speakers

Britannica.com: Encyclopedia article about thesis

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[ thee -sis ]

He vigorously defended his thesis on the causes of war.

Synonyms: proposal , contention , theory

  • a subject for a composition or essay.
  • a dissertation on a particular subject in which one has done original research, as one presented by a candidate for a diploma or degree.
  • Music. the downward stroke in conducting; downbeat. Compare arsis ( def 1 ) .
  • a part of a metrical foot that does not bear the ictus or stress.
  • (less commonly) the part of a metrical foot that bears the ictus. Compare arsis ( def 2 ) .
  • Philosophy. Hegelian dialectic

/ ˈθiːsɪs /

  • a dissertation resulting from original research, esp when submitted by a candidate for a degree or diploma
  • a doctrine maintained or promoted in argument
  • a subject for a discussion or essay
  • an unproved statement, esp one put forward as a premise in an argument
  • music the downbeat of a bar, as indicated in conducting
  • (in classical prosody) the syllable or part of a metrical foot not receiving the ictus Compare arsis
  • philosophy the first stage in the Hegelian dialectic, that is challenged by the antithesis
  • The central idea in a piece of writing, sometimes contained in a topic sentence .

Discover More

Word history and origins.

Origin of thesis 1

Example Sentences

“The Saudis have been proving the thesis of the film — they do in fact have an army,” said Thor Halvorssen, founder and chief executive of the nonprofit Human Rights Foundation, which funded the movie.

It’s a hypothesis that Bush pursued in her master’s thesis, and last year she began attending virtual Goth parties in a final round of field work before defending her doctoral thesis later this year.

While this partnership was planned prior to the coronavirus outbreak, co-founder Jordana Kier said the pandemic instantly proved out the expansion thesis.

They’ve had to defend that thesis for a very, very long time in front of a variety of different customers and different people.

Over the past decade, In-Q-Tel has been one of the most active investors in the commercial space sector, with a broad investment thesis that touches many aspects of the sector.

In “Back Home,” Gil also revisits the nostalgia for the South explored in his Johns Hopkins thesis, “Circle of Stone.”

At least father and son were in alignment on this central thesis: acting “gay”—bad; being thought of as gay—bad.

Her doctoral thesis, says Ramin Takloo at the University of Illinois, was simply outstanding.

Marshall McLuhan long ago argued the now accepted thesis that different mediums have different influences on thinking.

He wrote his Master's thesis on the underrepresentation of young people in Congress.

And indeed for most young men a college thesis is but an exercise for sharpening the wits, rarely dangerous in its later effects.

It will be for the reader to determine whether the main thesis of the book has gained or lost by the new evidence.

But the word thesis, when applied to Systems, does not mean the 'position' of single notes, but of groups of notes.

This conclusion, it need hardly be said, is in entire agreement with the main thesis of the preceding pages.

Sundry outlying Indians, with ammunition to waste, took belly and knee rests and strengthened the thesis to the contrary.

Related Words

  • proposition
  • supposition

What Is The Plural Of Thesis?

Plural word for  thesis.

The plural form of thesis is theses , pronounced [ thee -seez ]. The plurals of several other singular words that end in -is are also formed in this way, including hypothesis / hypotheses , crisis / crises , and axis / axes . A similar change is made when pluralizing appendix as appendices . 

Irregular plurals that are formed like theses derive directly from their original pluralization in Latin and Greek.

Grammarflex

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What’s the Plural of Thesis? (Thesises? Theses?)

  • November 13, 2022

what is plural for theses

What’s the plural of “thesis”?

Thesis , (and its plural theses ) is an example of one of the many common English words that has roots elsewhere. In this case, thesis is a word that has roots all the way back to Ancient Greek. Like other similarly structured words: diagnosis , synthesis , analysis , oasis , crisis , nemesis and the like, thesis is by no means the only frequently used Greek word that’s made it to Modern English.

What’s the singular of thesis?

"Thesis" singular in sentences.

Thesis is a singular noun and refers to one thing (or one thesis ).

What’s a thesis?

Merriam-Webster defines the noun thesis (plural theses ) as follows, “a dissertation embodying results of original research and especially substantiating a specific view especially : one written by a candidate for an academic degree.”

what is plural for theses

Nouns that end in -sis/ses

Thesis is an irregular plural noun that does not end in the typical -s / -es that regular plural noun forms take. This is so despite that theses plural does in fact end in the conventional -s/-es suffix. Why is it still considered irregular; then, given that it follows the regular plural form? Notice the following regular plural noun forms:

what is plural for theses

Thesis / theses operates differently. With these Greek words, the -ses does not simply  add onto the end of the singular form of the noun; instead, -ses replaces the singular noun’s suffixes, and effectively changes the entire spelling of the word (and arguably the word itself.)

crises

Examples of “thesis” (singular) in sentences

His master thesis was on modal neural networks.
She wrote her thesis on Renaissance Nativity scenes.
We disagreed with the basic thesis of the report.
I’ve made a first draft of my thesis .
The student’s experiments helped her formulate a thesis to share with her professor and classmates.

Examples of “theses” (plural) in sentences

It must not be assumed that Luther’s ninety-five theses produced any considerable direct results.
The collection of theses are ready for publication.
Twenty years after Savonarola’s death Martin Luther made public his theses against indulgences.
Theses are generally examined by two or more specialists.
Theses is the plural form of the singular noun thesis.

Origin of the word “thesis”

Thesis / theses are of Greek origin.

Read about other irregular nouns

  • What’s the plural of bison?
  • What’s the plural of moose?
  • What’s the plural of sheep?
  • What’s the plural of ox?
  • What’s the plural of cactus?
  • What’s the plural of crisis?
  • What’s the plural of hypothesis?

Read about other topics in grammar

  • What’re personal pronouns?
  • What’s the difference between they’re, their, and there?
  • Whose vs who’s?
  • Merriam-Webster, thesis/theses.

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ESLBUZZ

Plural of Thesis: A Quick Guide for English Learners

By: Author ESLBUZZ

Posted on Last updated: October 11, 2023

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Do you know the plural of thesis? Understanding the correct plural of thesis is important not only for academic writing, but for general communication as well. Whether you’re discussing multiple research papers or simply trying to sound knowledgeable in a conversation, using the correct plural form can help you make a good impression and avoid any confusion or misunderstandings.

Plural of Thesis

Plural of Thesis: A Quick Guide for English Learners

Definition and Plural of Thesis

When writing a research paper or dissertation, the central argument or main point is known as a thesis. A thesis is a statement or proposition that is put forward as a premise to be maintained or proved. It is a crucial element of academic writing and is often required for a degree or certification.

The plural of thesis is “theses.” In English, most nouns form the plural by adding an “s” at the end. However, “thesis” is one of the few exceptions to this rule. The word “thesis” has a Greek root, and “theses” is how it is pluralized in that original language.

Singular Plural
Thesis Theses

It is important to note that “theses” is the only way to make the noun “thesis” plural. There is no alternative form of the plural for this word.

In academic writing, the plural form “theses” is commonly used when referring to multiple research papers or dissertations. For example, “I have read several theses on this topic, and they all have different viewpoints.”

When to Use Thesis and Its Plural Form

When writing academic papers or conducting research, it is important to understand when to use the word “thesis” and its plural form, “theses.” Here are some guidelines to help you use these words correctly:

  • Use “thesis” when referring to a single research paper or dissertation that presents a specific argument or viewpoint.
  • Use “theses” when referring to multiple research papers or dissertations.
  • Remember that “thesis” is a singular noun and “theses” is its plural form.
  • Be aware that “thesis” has a Greek root and follows the same pluralization rule as other Greek words ending in “-is,” such as “crisis” and “analysis.” They become “crises” and “analyses,” respectively.
  • Keep in mind that “thesis” can also refer to a statement or proposition that is put forward for consideration or discussion. In this case, the plural form would be “theses.”
  • When citing multiple theses in a paper, use “theses” to indicate the plurality. For example, “The theses presented in this paper all support the idea that…”

Examples of Thesis and Its Plural Form in Sentences

If you are wondering how to use the word “thesis” in a sentence, here are a few examples:

  • Your thesis statement should be clear and concise.
  • The professor asked us to submit our theses by the end of the semester.
  • The thesis of the article is that climate change is caused by human activity.
  • She spent months researching and writing her thesis on the history of feminism .
  • The committee was impressed by the depth and originality of his thesis.

As you can see, “thesis” is used to refer to a statement or argument put forth by a writer or speaker, as well as a research paper written by a student to earn a degree.

Now, let’s take a look at the plural form of “thesis.” According to Grammar Monster, the only correct way to form the plural of “thesis” is “theses.” Here are some examples of how to use “theses” in a sentence:

  • The library has a collection of theses written by graduate students.
  • The professor asked us to read several theses on the topic before starting our own research.
  • The theses presented at the conference covered a wide range of topics.
  • The committee was impressed by the quality and originality of the theses submitted.

Plural Noun Rules for Regular Nouns

When forming the plural of regular nouns, there are some standard rules to follow. These rules apply to most English nouns, including “thesis.” Here are the basic guidelines:

  • For most singular nouns, simply add an “-s” to the end to form the plural. For example, “book” becomes “books,” “car” becomes “cars,” and “house” becomes “houses.”
  • If the singular noun ends in “-s,” “-x,” “-z,” “-ch,” or “-sh,” add “-es” to form the plural. For example, “bus” becomes “buses,” “box” becomes “boxes,” “buzz” becomes “buzzes,” “church” becomes “churches,” and “dish” becomes “dishes.”
  • If the singular noun ends in a consonant followed by “-y,” change the “-y” to “-ies” to form the plural. For example, “city” becomes “cities,” “baby” becomes “babies,” and “story” becomes “stories.”
  • If the singular noun ends in a vowel followed by “-y,” simply add an “-s” to form the plural. For example, “boy” becomes “boys,” “key” becomes “keys,” and “day” becomes “days.”

It’s important to note that there are some irregular nouns that don’t follow these rules. For example, “child” becomes “children,” “foot” becomes “feet,” and “tooth” becomes “teeth.” However, “thesis” is a regular noun, so it follows the standard rules for forming the plural.

Plural Noun Rules for Irregular Nouns

When it comes to forming the plural of nouns in English, there are some general rules that apply to most words. However, there are also many irregular nouns that don’t follow these rules and have unique plural forms. In this section, we’ll go over some common irregular plural nouns and the rules for forming their plurals.

List of Common Irregular Plural Nouns

Here are some examples of irregular plural nouns that you may come across:

Singular Plural
Child Children
Foot Feet
Goose Geese
Man Men
Mouse Mice
Tooth Teeth
Woman Women

Nouns that End in Us

Nouns that end in “us” often have a plural form that ends in “i”. For example:

Singular Plural
Cactus Cacti
Focus Foci
Radius Radii

Nouns that End in Is

Nouns that end in “is” may have a plural form that ends in “es”. For example:

Singular Plural
Analysis Analyses
Basis Bases
Crisis Crises

Nouns that End in On

Nouns that end in “on” may have a plural form that ends in “a”. For example:

Singular Plural
Criterion Criteria
Phenomenon Phenomena
Vertex Vertices

Plurals That Are the Same as Singulars

Some nouns have the same form for both the singular and plural. For example:

Singular Plural
Deer Deer
Fish Fish
Sheep Sheep

Words That Look Like Plural Nouns but Are Singular Nouns

Some words may look like plural nouns but are actually singular nouns. For example:

Singular Plural
News
Mathematics
Physics

Collective Nouns and List

When it comes to forming the plural of nouns, collective nouns can be a bit tricky. A collective noun refers to a group of people or things as a single entity. For example, “team” is a collective noun because it refers to a group of individuals working together towards a common goal.

The challenge with collective nouns is deciding whether to treat them as singular or plural. In American English, collective nouns are usually treated as singular, while in British English, they can be treated as either singular or plural depending on the context.

Here are some examples of collective nouns and how they can be treated in different contexts:

Collective Noun Singular Example Plural Example
audience The audience is enjoying the show. The audience are clapping their hands.
family My family is going on vacation. My family are all different ages.
staff The staff is working hard. The staff are taking their lunch breaks.

As you can see, the choice of whether to use a singular or plural verb depends on whether you are referring to the group as a single entity or as individuals within the group.

When it comes to forming the plural of collective nouns, the same rules apply as for regular nouns. For example, the plural of “team” is “teams”, and the plural of “family” is “families”.

Plural Nouns vs. Possessive Nouns

When it comes to forming the plural of nouns, there are standard rules that apply to most words in the English language. However, there are some exceptions, such as the word “thesis.” The plural of “thesis” is “theses,” and this is the only correct way to form the plural of this word.

On the other hand, when it comes to forming possessive nouns, there are a few rules to keep in mind. Here are some key points to remember:

  • For singular nouns, add an apostrophe and an “s” to show possession. For example, “the thesis’s conclusion” means the conclusion belonging to the thesis.
  • For plural nouns that end in “s,” add only an apostrophe to show possession. For example, “the theses’ conclusions” means the conclusions belonging to the theses.
  • For plural nouns that do not end in “s,” add an apostrophe and an “s” to show possession. For example, “women’s rights” means the rights belonging to women.

It’s important to note that possessive nouns should not be confused with plural nouns. While they may look similar, they serve different grammatical functions. Possessive nouns show ownership or possession, while plural nouns simply refer to more than one of something.

Common Mistakes with Plural Nouns

When it comes to forming the plural of nouns, there are some common mistakes that are made. Here are a few things to keep in mind when forming the plural of the word “thesis” and other nouns:

Adding an Apostrophe

One common mistake is adding an apostrophe to a noun to make it plural. For example, “the thesis’s” instead of “the theses.” This is incorrect and should be avoided.

Irregular Plurals

Some nouns have irregular plurals that do not follow the standard rules. For example, “child” becomes “children” and “goose” becomes “geese.” It is important to learn these irregular plurals to avoid mistakes.

Confusion over Plurals

Some nouns, like “thesis,” can cause confusion over their plural form. “Theses” is the only correct way to make “thesis” plural. Other words that end in “-is” may also have irregular plurals, such as “crisis” becoming “crises.”

Using Incorrect Count Nouns

It is important to use the correct count nouns when referring to multiple instances of something. For example, “studies” instead of “researches,” and “pieces of evidence” instead of “evidences.” Using the incorrect count noun can make your writing sound awkward or confusing.

Frequently Asked Questions

What is the correct plural form of ‘thesis’?

The correct plural form of ‘thesis’ is ‘theses.’ It is an irregular plural noun that does not follow the typical -s/-es suffix used for regular plural nouns.

How is ‘thesis’ used in a sentence?

‘Thesis’ refers to a statement or theory that is put forward as a premise to be maintained or proved. An example sentence would be: “Her thesis on the effects of climate change was well-researched and presented.”

What is the origin of the word ‘thesis’?

The word ‘thesis’ comes from the Greek word ‘tithenai,’ which means ‘to place’ or ‘to put.’ In academia, it refers to a statement or theory that is put forward as a premise to be maintained or proved.

What is the difference between ‘thesis’ and ‘theses’?

‘Thesis’ is the singular form of the word, while ‘theses’ is the plural form. ‘Thesis’ refers to a single statement or theory, while ‘theses’ refers to multiple statements or theories.

The plural of thesis is the word 'theses'.

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To pluralize 'thesis', you simply add 'es' to the end of the word. This is because 'thesis' ends in 'is', which is a singular noun ending.

"}},{"@type":"Question","name":"Is the plural of thesis 'theses'?","acceptedAnswer":{"@type":"Answer","text":"

Yes, the plural of thesis is 'theses'.

"}},{"@type":"Question","name":"What is the irregular plural form of thesis?","acceptedAnswer":{"@type":"Answer","text":"

'Theses' is not an irregular plural form of thesis. It is a regular plural form.

"}},{"@type":"Question","name":"What are some examples of irregular plural nouns?","acceptedAnswer":{"@type":"Answer","text":"

Some examples of irregular plural nouns include 'child' (children), 'tooth' (teeth), and 'foot' (feet).

"}},{"@type":"Question","name":"How do you correctly pluralize nouns ending in -is?","acceptedAnswer":{"@type":"Answer","text":"

To correctly pluralize nouns ending in -is, you simply change the 'is' to 'es'. For example, the plural of 'thesis' is 'theses', and the plural of 'analysis' is 'analyses'.

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Definition of thesis noun from the Oxford Advanced Learner's Dictionary

  • Students must submit a thesis on an agreed subject within four years.
  • He presented this thesis for his PhD.
  • a thesis for a master's degree
  • He's doing a doctoral thesis on the early works of Shostakovich.
  • Many departments require their students to do a thesis defense.
  • She completed an MSc by thesis.
  • her thesis adviser at MIT
  • in a/​the thesis
  • thesis about

Want to learn more?

Find out which words work together and produce more natural-sounding English with the Oxford Collocations Dictionary app. Try it for free as part of the Oxford Advanced Learner’s Dictionary app.

what is plural for theses   (tʻez)   ,   (tézis),   (palažénnje),   (téza)     (téza),     (tézis)     (leon dim ), (leon tai )   (lùndiǎn),   (lùntí)       ,             ,             (tezisi)       (thésis)       ,       (tēze),   (ろんだい, rondai),   (しゅちょう, shuchō),   (ていりつ, teiritsu) (teje), (nonje), (ronje) (North Korea)     (teza)                 (tɛ́zis),     (položénije)                   ,   ,   ,   ,     (téza),   (tézys),   (polóžennja)  
  (ʔuṭrūḥa)   (atenaxosutʻyun),   (disertacʻia), (diplomayin ašxatankʻ)     (dysjertácyja),   (dysertácyja),   (dyplómnaja rabóta)     (disertácija)     ,     (leon man )   (lùnwén)     ,       ,     ,       ,   ;   ;           ,   (diserṭacia)     ,     ,     ,     ,     ,     (only a doctoral thesis) (mahāśodh nibandh)     (téza)   ,   (postgraduate),           (ろんぶん, ronbun) (dissertasiä), (diplomdyq jūmys)   (nɨkkheepaʼbɑt)   (nonmun),   (ronmun) (North Korea) (dissertatsiya)   (wi tha nyā ni phon)         (disertacija)   or     , (pâyân-nâme),       ,           ,         (dissertácija),   (diplómnaja rabóta)         ,     ,         ,     (dissertatsiya)   (wít-tá-yaa-ní-pon),   (bpà-rin-yaa-ní-pon),   (ní-pon)   , ,   (dysertácija),   (dyplómna robóta)   , ,  
  (thésis)  
  • ^ “ thē̆sis, n. ”, in MED Online , Ann Arbor, Mich.: University of Michigan , 2007 .
  • ^ “ thesis, n. ”, in Lexico , Dictionary.com ; Oxford University Press , 2019–2022 .

Further reading

  • “ thesis ”, in The Century Dictionary   [ … ] , New York, N.Y.: The Century Co. , 1911 , →OCLC .
  • “ thesis ”, in Webster’s Revised Unabridged Dictionary , Springfield, Mass.: G. & C. Merriam , 1913 , →OCLC .
  • Heists , Sethis , heists , shiest , shites , sithes , thises

From Latin thesis , from Ancient Greek θέσις ( thésis , “ a proposition, a statement, a thing laid down, thesis in rhetoric, thesis in prosody ” ) .

Audio: ( )

thesis   f ( plural theses or thesissen , diminutive thesisje   n )

  • Dated form of these . Synonyms: dissertatie , proefschrift , scriptie

From Ancient Greek θέσις ( thésis , “ a proposition, a statement, a thing laid down, thesis in rhetoric, thesis in prosody ” ) .

  • ( Classical Latin ) IPA ( key ) : /ˈtʰe.sis/ , [ˈt̪ʰɛs̠ɪs̠]
  • ( modern Italianate Ecclesiastical ) IPA ( key ) : /ˈte.sis/ , [ˈt̪ɛːs̬is]

thesis   f ( genitive thesis ) ; third declension

Case Singular Plural

Descendants

  • → Dutch: thesis
  • → Armenian: թեզ ( tʻez )
  • → Dutch: these
  • → Persian: تز ( tez )
  • → Romanian: teză
  • → Turkish: tez
  • Galician: tese
  • Italian: tesi
  • English: thesis
  • Portuguese: tese
  • Spanish: tesis
  • “ thesis ”, in Charlton T. Lewis and Charles Short ( 1879 ) A Latin Dictionary , Oxford: Clarendon Press
  • thesis in Gaffiot, Félix ( 1934 ) Dictionnaire illustré latin-français , Hachette.

what is plural for theses

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Whats the Plural of Thesis: Understanding Singular and Plural Forms

  • The plural of “thesis” adheres to the Greek-rooted pattern, changing the singular -is to a plural -es.
  • Accurate use of “thesis” and “theses” reflects scholarly precision in both written and oral communication.
  • Awareness of correct pluralization extends to other similar nouns ending in -sis, emphasizing the importance of understanding language origins.

It is crucial to use the word correctly in both singular and plural contexts to maintain the integrity of written and spoken communication. In the realm of academics, precision in language reflects the rigor of one’s research and argumentation. As such, understanding the transformation from “thesis” to its plural counterpart is more than a trivial detail; it reflects a deeper appreciation for the structure and history of the English language.

What’s the Plural of Thesis?

The proper plural of thesis is “theses.” This transformation is part of a broader pattern in the English language where certain nouns change their ending to reflect a plural state.

Below, a comparison is made to illustrate the standard singular to plural transformation for nouns ending in -is:

SingularPlural
thesistheses
crisiscrises
oasisoases

Key Points about the pluralization of “thesis”:

  • The plural follows a specific rule of changing the ‘-is’ ending to ‘-es’.
  • This pattern is consistent with other Greek-derived words.
  • The pronunciation changes with the plural form, ending in “-eez.”

To clarify usage, consider these examples:

  • Singular: The student’s thesis was commended for its clarity.
  • Plural: The professor read all the submitted theses before the conference.

Singular Form of Thesis

The singular form of ‘thesis’ is of notable interest due to its origins and distinct pluralization.

Origination and Definition:

  • Etymology : Derived from the ancient Greek word τίθημι (tithēmi), which means “to put” or “to place.”
  • Meaning : It is a statement or theory put forward to be maintained or proved.

Usage in Academia:

  • A significant piece of writing prepared by a student to obtain a university degree or diploma.
  • Often involves original research and substantiates a particular view or argument.

Table 1: Notable Features of ‘Thesis’

FeaturesDescription
Pronunciation/ˈθiːsɪs/
Syllable StructureTwo
Grammatical NumberSingular

Table 2: Contextual Examples

ContextExample Sentence
In a Proposal“Her proposal was accepted by the advisory committee.”
During Defense“He defended his rigorously to earn his master’s degree.”
In Academic Writing“The central of the book is well-supported with evidence.”

Definition of Thesis

A thesis is a substantial piece of scholarly writing that is typically required to obtain a master’s or doctoral degree. It represents the author’s research and findings in their chosen field of study. A thesis serves as evidence that the student has acquired the knowledge necessary to be considered a scholar in the field. Here, two key aspects of a thesis will be described through tables:

Purpose and Composition of a Thesis:

To present original researchIntroduction
To showcase the author’s understanding and proficiencyLiterature Review
To contribute to the academic communityMethodology
To fulfill a requirement for a graduate degreeResults/Discussion
 Conclusion

Characteristics of a Thesis:

  • Focused : It should have a clear, concise premise or central argument.
  • Researched : Employs rigorous methodologies to gather and analyze data.
  • Structured : Contains defined sections that present information logically.
  • Cited : Includes proper citations of sources that support or contrast the thesis.
  • Reviewed : Undergoes scrutiny by academic peers or supervisors.

Other Irregular Plural Nouns Ending in -sis/ses

Below you will find two tables categorized by common and less common irregular plurals that follow this pattern.

Common Irregular Plurals:

SingularPlural
analysisanalyses
hypothesishypotheses
parenthesisparentheses
thesistheses

This pattern is often observed with words that have Greek origins.

Less Common Irregular Plurals:

SingularPlural
basisbases
crisiscrises
oasisoases

It is important to recognize these forms to maintain grammatical accuracy in writing and speech. Below is a list of examples used in sentences:

  • When multiple scientific hypotheses are tested, the results can lead to important discoveries.
  • During the editing process, Jane had to review all the parentheses to ensure clarity in her writing.
  • Geographers study multiple oases in the desert to understand these unique ecosystems.
  • His thesis on renewable energy was well-received, and many theses on the subject reference his work.

Examples of Thesis (Singular) in Sentences

Here are examples that demonstrate its usage in various sentences.

In Academic Context

Subject Area Sentence
Literature His thesis explores the symbolism in Victorian poetry.
Science The thesis provides a groundbreaking approach to climate change mitigation.

In Everyday Discourse

Informal setting : During the debate, his thesis was that space exploration is no longer just a dream but a necessity.

  • Discussing beliefs : Her thesis is that all public spaces should offer free Wi-Fi.
  • Opinion : They argued the thesis that high taxes discourage spending.

Examples of Theses (Plural) in Sentences

Here are some examples of how “theses” can be used in sentences:

The library’s collection includes theses from graduates over the decades. Indicates possession of multiple papers by the library.
She compared multiple theses to ensure her research was comprehensive. Shows the act of reviewing several papers.
The committee requested summaries of the proposed theses before approval. Used as the subject of the committee’s requests.
Theses covering revolutionary medical findings were presented at the conference. Theses acting as the main topic at a professional event.

Education Setting : Graduate students often struggle to find unique topics for their theses as most ideas have been extensively explored.

  • Evaluating the structure and arguments of different theses can help one build a stronger dissertation.

Origin of the Word Thesis

The term thesis originates from the ancient Greek word θέσις (thésis), which means “a proposition” . Historically, this term has played a crucial role in both rhetorical and academic contexts. It denotes a statement that a writer intends to support and prove. In academic circles, thesis often refers to a document that presents the author’s research and findings and is submitted in support of candidature for a degree or professional qualification.

Etymological Background

The journey of the word from its Greek roots to the modern English language reflects the changing dynamics of educational and scholarly practices over the centuries.

Greek OriginModern English Equivalent
θέσις (thésis)Thesis

As a carryover from Greek to Latin, the word made its way into English, maintaining its original Greek plural form:

SingularPlural
ThesisTheses

Usage in Academia

In academia, the word has been used since the late Middle Ages to denote a scholarly work written by students aiming to obtain a university degree. Over time, the use of thesis expanded from merely referring to a proposition to a lengthy document providing evidence of comprehensive research.

Historical Evolution:

  • Middle Ages : Referred to propositions for a degree.
  • Renaissance : Emphasized individual research.
  • Modern Usage : Extensive research documents for higher education degrees.

Areas of Impact:

  • Rhetoric : Considered as a premise to be argued.
  • Academic Research : Reflects comprehensive study in a field.

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Theses or Thesis - What's the difference?

As nouns the difference between thesis and theses, derived terms, related terms, external links.

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Meaning of thesis in English

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  • I wrote my thesis on literacy strategies for boys .
  • Her main thesis is that children need a lot of verbal stimulation .
  • boilerplate
  • composition
  • corresponding author
  • dissertation
  • essay question
  • peer review

You can also find related words, phrases, and synonyms in the topics:

thesis | American Dictionary

Examples of thesis, collocations with thesis.

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Translations of thesis

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  • thesis (noun)
  • She wrote her thesis on Renaissance Nativity scenes.
  • a master's/doctoral thesis on the effects of global warming
  • New evidence supports his thesis .
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thesis noun

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What does the noun thesis mean?

There are seven meanings listed in OED's entry for the noun thesis . See ‘Meaning & use’ for definitions, usage, and quotation evidence.

thesis has developed meanings and uses in subjects including

Entry status

OED is undergoing a continuous programme of revision to modernize and improve definitions. This entry has not yet been fully revised.

How common is the noun thesis ?

How is the noun thesis pronounced?

British english, u.s. english, where does the noun thesis come from.

Earliest known use

Middle English

The earliest known use of the noun thesis is in the Middle English period (1150—1500).

OED's earliest evidence for thesis is from before 1398, in a translation by John Trevisa, translator.

thesis is a borrowing from Greek.

Etymons: Greek θέσις .

Nearby entries

  • thesaurus, n. 1823–
  • thesaury, n. a1639–1708
  • these, n. a1600–48
  • these, pron. & adj. Old English–
  • Thesean, adj. 1815–
  • Theseid, n. 1725–
  • Theseium, n. 1819–
  • these-like, adj. 1644–
  • thesial, adj. 1654
  • thesicle, n. 1863–
  • thesis, n. a1398–
  • thesis-novel, n. 1934–
  • thesis-play, n. 1902–
  • thesmophilist, n. 1644–
  • Thesmophorian, adj. 1891–
  • Thesmophoric, adj. 1788–
  • thesmothete, n. 1603–
  • thesocyte, n. 1887–
  • thesp, n. 1962–
  • Thespian, adj. & n. 1675–
  • Thespianism, n. 1914–

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Meaning & use

Pronunciation, compounds & derived words, entry history for thesis, n..

thesis, n. was first published in 1912; not yet revised.

thesis, n. was last modified in December 2023.

Revision of the OED is a long-term project. Entries in oed.com which have not been revised may include:

  • corrections and revisions to definitions, pronunciation, etymology, headwords, variant spellings, quotations, and dates;
  • new senses, phrases, and quotations which have been added in subsequent print and online updates.

Revisions and additions of this kind were last incorporated into thesis, n. in December 2023.

Earlier versions of this entry were published in:

OED First Edition (1912)

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  • View thesis in OED Second Edition

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Citation details

Factsheet for thesis, n., browse entry.

is   Plural

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Is thesis plural

Thesis is singular both plural and singular both plural and singular singular plural plural both plural and singular plural singular .

The plural plural plural singular singular plural singular plural singular of thesis is theses .

How to say thesis: How to pronounce thesis

How to say theses: How to pronounce theses

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Not sure why thesis is singular both both singular plural plural both plural singular ?   Contact Us !   We'll explain.

1.  What makes words plural? 2.  What makes a word singular? 3.  How to make acronyms plural.

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COMMENTS

  1. The Plural of Thesis

    "Theses" is the only way to make the noun "thesis" plural. Confusion arises because some mistakenly believe that all nouns ending in "s" should form a plural that adds "es" to the end of the word. When a noun ends with "is," you need to replace the "is" with an "es" to form the plural. This is because its plural form derives from Greek.

  2. What Is the Plural of Thesis

    Thesis becomes theses in plural form for two reasons: 1) The word thesis has a Greek root, and theses is how it is pluralized in that original language. 2) There are many English words ending with -is that take on -es endings when pluralized: e.g., crisis becomes crises. The pluralization isn't all that unique.

  3. THESES

    THESES definition: 1. plural of thesis 2. plural of thesis . Learn more.

  4. Thesis Definition & Meaning

    The meaning of THESIS is a dissertation embodying results of original research and especially substantiating a specific view; especially : one written by a candidate for an academic degree. ... But a thesis may also be an idea; so in the course of the paper the student may put forth several theses (notice the plural form) and attempt to prove ...

  5. THESIS Definition & Meaning

    Thesis definition: a proposition stated or put forward for consideration, especially one to be discussed and proved or to be maintained against objections. See examples of THESIS used in a sentence.

  6. What's the Plural of Thesis? (Thesises? Theses?)

    The collection of theses are ready for publication. Twenty years after Savonarola's death Martin Luther made public his theses against indulgences. Theses are generally examined by two or more specialists. Theses is the plural form of the singular noun thesis. ‍ Origin of the word "thesis" ‍ Thesis/theses are of Greek origin.

  7. THESES

    THESES meaning: 1. plural of thesis 2. plural of thesis . Learn more.

  8. THESIS

    THESIS meaning: 1. a long piece of writing on a particular subject, especially one that is done for a higher…. Learn more.

  9. Plural of Thesis: A Quick Guide for English Learners

    A thesis is a statement or proposition that is put forward as a premise to be maintained or proved. It is a crucial element of academic writing and is often required for a degree or certification. The plural of thesis is "theses.". In English, most nouns form the plural by adding an "s" at the end.

  10. thesis noun

    (plural theses /ˈθiːsiːz/ ... thesis (that…) a statement or an opinion that is discussed in a logical way and presented with evidence in order to prove that it is true. The basic thesis of the book is fairly simple. These latest findings support the thesis that sexuality is determined by nature rather than choice.

  11. thesis

    thesis (plural theses) ( rhetoric) A proposition or statement supported by arguments. (by extension) A lengthy essay written to establish the validity of a thesis (sense 1.1), especially one submitted in order to complete the requirements for a non- doctoral degree in the US and a doctoral degree in the UK; a dissertation .

  12. Is theses plural?

    plural. plural singular singular singular. . The. singular plural plural plural. singular. plural singular singular plural. of theses is thesis. How to say theses:

  13. What is the plural of thesis?

    The plural form of thesis is theses . Find more words! They can continue classes or use the research as their master's theses and doctoral dissertations. Today, most universities require their students to submit electronic theses and dissertations for their graduation. This synthesis is based on public domain data, including published papers ...

  14. Whats the Plural of Thesis: Understanding Singular and Plural Forms

    The plural of "thesis" adheres to the Greek-rooted pattern, changing the singular -is to a plural -es. Accurate use of "thesis" and "theses" reflects scholarly precision in both written and oral communication. Awareness of correct pluralization extends to other similar nouns ending in -sis, emphasizing the importance of understanding language origins.

  15. Theses or Thesis

    Noun. ( theses ) A statement supported by arguments. A written essay, especially one submitted for a university degree. * Goldsmith. I told them of the grave, becoming, and sublime deportment they should assume upon this mystical occasion, and read them two homilies and a thesis of my own composing, to prepare them. (logic) An affirmation, or ...

  16. THESIS definition in American English

    thesis in American English. (ˈθisɪs) noun Word forms: plural -ses (-siz) 1. a proposition stated or put forward for consideration, esp. one to be discussed and proved or to be maintained against objections. He vigorously defended his thesis on the causes of war. 2. a subject for a composition or essay. 3.

  17. THESIS

    THESIS definition: 1. a long piece of writing on a particular subject, especially one that is done for a higher…. Learn more.

  18. Thesis Definition & Meaning

    plural theses / ˈθiːˌsiːz/. Britannica Dictionary definition of THESIS. [count] 1. : a long piece of writing on a particular subject that is done to earn a degree at a university. She wrote her thesis on Renaissance Nativity scenes. a master's/doctoral thesis on the effects of global warming. 2. formal : a statement that someone wants to ...

  19. thesis, n. meanings, etymology and more

    There are seven meanings listed in OED's entry for the noun thesis. See 'Meaning & use' for definitions, usage, and quotation evidence. thesis has developed meanings and uses in subjects including. prosody (Middle English) music (Middle English) rhetoric (late 1500s) logic (late 1500s) education (late 1700s) philosophy (1830s)

  20. Is thesis plural?

    singular plural both plural and singular plural plural both plural and singular. . The. singular plural. plural. singular plural plural singular plural singular. of thesis is theses. How to say thesis: How to pronounce thesis.