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Thoery vs. Theory — Which is Correct Spelling?

By Tayyaba Rehman — Updated on April 1, 2024
"Thoery" is an incorrect spelling. "Theory" is the correct spelling, representing a system of ideas explaining something.
Thoery vs. Theory — Which is Correct Spelling?

Which is correct: Thoery or Theory

How to spell Theory?


Incorrect Spelling


Correct Spelling

Key Differences

Think of the word "the" at the beginning of "Theory."
Remember the order: "theo" comes before "ry" in "Theory."
Recollect that "theory" is related to "theoretical" — both start with "theo."
"Theory" rhymes with "eerie," which does not have the "o" before the "e."
Use mnemonic: "Theories explain the unknown," focusing on the "the" at the start.

How Do You Spell Theory Correctly?

Incorrect: Their thoery on quantum mechanics changed the field.
Correct: Their theory on quantum mechanics changed the field.
Incorrect: The thoery was proven incorrect after further research.
Correct: The theory was proven incorrect after further research.
Incorrect: She developed a thoery based on her observations.
Correct: She developed a theory based on her observations.
Incorrect: He explained his thoery to the class.
Correct: He explained his theory to the class.
Incorrect: His thoery on evolution was widely debated.
Correct: His theory on evolution was widely debated.

Theory Definitions

The general principles of a subject.
Music theory explores the structure of compositions.
A contemplative and rational type of abstract thinking.
Philosophy often engages in theory more than concrete facts.
A hypothesis assumed for the sake of argument.
For the sake of theory, let's assume the data is accurate.
A set of statements or principles devised to explain a group of facts or phenomena, especially one that has been repeatedly tested or is widely accepted and can be used to make predictions about natural phenomena.
The branch of a science or art consisting of its explanatory statements, accepted principles, and methods of analysis, as opposed to practice
A fine musician who had never studied theory.
A set of theorems that constitute a systematic view of a branch of mathematics.
Abstract reasoning; speculation
A decision based on experience rather than theory.
A belief or principle that guides action or assists comprehension or judgment
Staked out the house on the theory that criminals usually return to the scene of the crime.
An assumption based on limited information or knowledge; a conjecture.
A description of an event or system that is considered to be accurate.
(sciences) A coherent statement or set of ideas that explains observed facts or phenomena and correctly predicts new facts or phenomena not previously observed, or which sets out the laws and principles of something known or observed; a hypothesis confirmed by observation, experiment etc.
(uncountable) The underlying principles or methods of a given technical skill, art etc., as opposed to its practice.
(mathematics) A field of study attempting to exhaustively describe a particular class of constructs.
Knot theory classifies the mappings of a circle into 3-space.
A hypothesis or conjecture.
A set of axioms together with all statements derivable from them; or, a set of statements which are deductively closed. Equivalently, a formal language plus a set of axioms (from which can then be derived theorems). The statements may be required to all be bound (i.e., to have no free variables).
A theory is consistent if it has a model.
A doctrine, or scheme of things, which terminates in speculation or contemplation, without a view to practice; hypothesis; speculation.
An exposition of the general or abstract principles of any science; as, the theory of music.
The science, as distinguished from the art; as, the theory and practice of medicine.
The philosophical explanation of phenomena, either physical or moral; as, Lavoisier's theory of combustion; Adam Smith's theory of moral sentiments.
A well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena;
Theories can incorporate facts and laws and tested hypotheses
True in fact and theory
A tentative theory about the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena;
A scientific hypothesis that survives experimental testing becomes a scientific theory
He proposed a fresh theory of alkalis that later was accepted in chemical practices
A belief that can guide behavior;
The architect has a theory that more is less
They killed him on the theory that dead men tell no tales
A system of ideas intended to explain something.
Einstein's theory of relativity revolutionized physics.
A belief or principle accepted as true without proof.
It's just a theory, but I think it might rain later.

Theory Meaning in a Sentence

The scientific method requires that a theory be testable.
His theory on economic growth was widely accepted.
She proposed a theory that explained the phenomenon perfectly.
He wrote a paper debunking a popular theory.
The theory of relativity revolutionized physics.
The theory was supported by data from numerous experiments.
The theory suggested a new way to approach the problem.
Her theory was a significant contribution to the field of psychology.
Her theory on social dynamics was published in a prestigious journal.
The theory integrates concepts from two different fields of study.
Her theory was initially met with skepticism.
The theory explains the behavior of particles at the quantum level.
They discussed the theory in detail during the seminar.
The theory of evolution explains the diversity of life.
His latest theory attracted a lot of attention in the scientific community.
The theory has implications for both science and philosophy.
The theory led to a breakthrough in medical research.
The theory proposed a solution to an age-old mystery.
He developed a theory that could predict the outcome of the experiments.
According to his theory, the process would be more efficient.
She based her experiment on a well-known theory.
The theory has been a subject of debate for decades.
They refined the theory after considering the new evidence.
The theory of gravity explains why objects fall to the ground.

Theory Idioms & Phrases

Just a theory

A phrase used to suggest that something is only a hypothesis and not yet proven.
Some say it's just a theory, but there's a lot of evidence supporting it.

Theory of everything

A hypothetical single, all-encompassing, coherent theoretical framework of physics that fully explains and links together all physical aspects of the universe.
Scientists are still searching for the theory of everything.

Set theory

A branch of mathematical logic that studies sets, which are collections of objects.
Set theory is a fundamental part of modern mathematics.

In theory

Something that should happen or work according to plans or ideas, but may not in reality.
In theory, the program could save the company money, but we need to see if it works in practice.

Game theory

A theory in economics and mathematics that examines competitors' behaviors in strategic situations where the outcome of a participant's choice of action depends on the actions of other participants.
Game theory can predict the outcome of competitive situations like auctions or negotiations.

Theory versus practice

The difference between what is supposed to happen according to theory and what actually happens in real life.
The new policy sounds good in theory, but theory versus practice will be the true test.

Common Curiosities

Which vowel is used before Theory?

The vowel "e" is used before the "o" in "Theory."

What is the verb form of Theory?

There's no direct verb form of "Theory." However, "theorize" is the related verb.

Why is it called Theory?

The term "Theory" is derived from the Greek word "theoria," meaning "a looking at, viewing, or contemplation."

What is the root word of Theory?

The root word is the Greek "theoria."

What is the singular form of Theory?

"Theory" is already in its singular form.

Is Theory an adverb?

No, "theory" is not an adverb.

Is Theory an abstract noun?

Yes, "theory" is an abstract noun.

Which preposition is used with Theory?

Common prepositions used with "theory" are "of," "in," and "about."

Which article is used with Theory?

Both "a" and "the" can be used with "theory."

What is the pronunciation of Theory?

"Theory" is pronounced as /ˈθiːəri/.

What is the plural form of Theory?

The plural form is "theories."

Is Theory a vowel or consonant?

The word "theory" contains both vowels and consonants.

Is the word Theory is imperative?

No, "theory" is not used in the imperative mood.

Is Theory a noun or adjective?

"Theory" is a noun.

Which determiner is used with Theory?

Determiners such as "this," "that," or "every" can be used.

Which conjunction is used with Theory?

There isn't a specific conjunction exclusively for "theory."

Is the Theory term a metaphor?

No, but it can be used metaphorically.

Is the word Theory is Gerund?

No, "theory" is not a gerund.

Is the word “Theory” a Direct object or an Indirect object?

"Theory" can function as a direct object, e.g., "She explained the theory."

How many syllables are in Theory?

Three syllables.

What part of speech is Theory?

It's a noun.

What is another term for Theory?

Hypothesis or conjecture.

What is the first form of Theory?

"Theory" is a noun and doesn't have verb forms.

How do we divide Theory into syllables?


What is a stressed syllable in Theory?

The first syllable, "The," is stressed.

What is the third form of Theory?

"Theory" doesn't have verb forms.

Is Theory a negative or positive word?

Neutral; it can be either depending on the context.

Is Theory a countable noun?

Yes, you can have one theory or multiple theories.

Is Theory a collective noun?

No, "theory" is not a collective noun.

What is the opposite of Theory?

Fact or reality.

What is the second form of Theory?

"Theory" doesn't have verb forms.

How is Theory used in a sentence?

"One popular theory suggests that dark matter makes up a significant portion of the universe."

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Author Spotlight

Written by
Tayyaba Rehman
Tayyaba Rehman is a distinguished writer, currently serving as a primary contributor to As a researcher in semantics and etymology, Tayyaba's passion for the complexity of languages and their distinctions has found a perfect home on the platform. Tayyaba delves into the intricacies of language, distinguishing between commonly confused words and phrases, thereby providing clarity for readers worldwide.

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