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Thoery vs. Theory: Mastering the Correct Spelling

Edited by Harlon Moss || By Janet White || Updated on March 12, 2024
Thoery is an incorrect spelling. The correct spelling is Theory, denoting a system of ideas explaining a phenomenon.

Which is correct: Thoery or Theory

How to spell Theory?

Thoery is Incorrect

Theory is Correct


Key Differences

Visualize a thermometer, noting the "the" in both.
Sound it out: The-o-ry, with “The” leading the pronunciation.
Think of “The” at the beginning of "Theory", as it's a foundational concept.
Remember, "o" always comes before "e" in "Theory."
Link it with scientific theory, which has "the" in it.

Correct usage of Theory

His thoery was disproven by recent studies.
His theory was disproven by recent studies.
The thoery behind this experiment is solid.
The theory behind this experiment is solid.
She developed a new thoery in her field.
She developed a new theory in her field.
He spent years working on his thoery.
He spent years working on his theory.
I don't agree with that thoery at all.
I don't agree with that theory at all.

Theory Definitions

A system of ideas intended to explain something.
Darwin's theory of evolution changed the scientific community.
A speculative idea or conjecture.
It's just a theory, but I think the cat hides when it hears the vacuum.
A set of principles underlying a domain of knowledge.
Music theory is essential for composers and musicians alike.
An assumption based on limited information.
My theory is that he's avoiding the topic intentionally.
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
An ideal or hypothetical situation.
In theory, the procedure should work smoothly.

Theory Sentences

The theory of evolution explains how species change over time.
He has a theory that sleep quality affects learning ability.
According to his theory, ancient civilizations were more advanced than we thought.
A scientific theory is based on evidence and experimentation.
Her theory on climate change emphasizes human impact.
The gravitational theory explains why objects fall to the ground.
She's developing a theory on the psychology of online behavior.
His theory suggests that happiness can increase productivity.
The theory of relativity changed how we understand time and space.
The theory of plate tectonics describes the movement of Earth's crust.
The Big Bang theory explains the origin of the universe.
She studies string theory, a framework in theoretical physics.
The theory of multiple intelligences proposes that people have different kinds of intelligences.
The chaos theory deals with complex systems that are highly sensitive to initial conditions.
A good theory can predict future outcomes.
The game theory deals with strategies in decision-making processes.
His theory on economics was revolutionary at the time.
His theory was that music has healing properties.
The hygiene theory suggests that early exposure to germs helps develop the immune system.
A conspiracy theory suggests that an event is the result of a secret plot.
She proposed a theory about the origin of the universe.
A theory must be testable and falsifiable.
The theory of quantum mechanics delves into the behavior of particles at the atomic level.
His social interaction theory examines how people communicate and bond.
The theory of natural selection was proposed by Charles Darwin.

Theory Idioms & Phrases

In theory

Something should work or be correct according to plans or calculations, but it might not actually happen that way.
In theory, the plan was flawless, but in practice, it was a disaster.

Theory vs. practice

The difference between how something should work in theory versus how it works in reality.
In theory, the new software should speed up processing, but theory vs. practice can be quite different.

Working theory

A theory that is provisionally accepted as a basis for further research.
The police have a working theory about the motive behind the crime.

Game theory

A branch of mathematics that studies and predicts decision-making in competitive situations where the outcome for each participant depends on the actions of all.
Game theory can explain the strategic behavior in economic competition.

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 a theory of everything that can explain the fundamental forces in the universe.

Set theory

The branch of mathematical logic that studies sets, which are collections of objects.
Set theory forms the basis of several other fields of mathematics.

The big bang theory

The prevailing cosmological model explaining the early development of the Universe.
The big bang theory states that the universe expanded from a very high-density and high-temperature state.

Just a theory

A phrase used to suggest that something is not proven or certain.
Some people dismiss climate change as just a theory, despite the overwhelming evidence.

String theory

A theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional strings.
String theory is a complex topic that aims to unite quantum mechanics and general relativity.

Conspiracy theory

A belief that some covert but influential organization is responsible for a circumstance or event.
There are many conspiracy theories surrounding the moon landing.


Which vowel is used before Theory?

The vowel "e" is used.

Why is it called Theory?

The term "Theory" comes from the Greek word "theōria," meaning contemplation or speculation.

What is the pronunciation of Theory?


What is the root word of Theory?

The root word is Greek "theōria."

What is the plural form of Theory?


Is Theory a negative or positive word?


What is the verb form of Theory?

The verb related to "Theory" is "theorize."

What is the singular form of Theory?


Is Theory a vowel or consonant?

It's a word, not a letter. It contains both vowels and consonants.

Which conjunction is used with Theory?

Any conjunction can be used based on the sentence, like "and" or "but."

Is Theory a noun or adjective?


Is Theory an adverb?


Is Theory a countable noun?


What is a stressed syllable in Theory?

The first syllable, "The."

What is the third form of Theory?

For the verb "theorize," it's "theorized."

Which preposition is used with Theory?

"of" as in "theory of relativity."

Which article is used with Theory?

"The" or "a" based on context.

Is Theory a collective noun?


How many syllables are in Theory?

Three syllables.

What is another term for Theory?


Which determiner is used with Theory?

Determiners like "the," "this," or "each" can be used.

What is the first form of Theory?

Theory doesn't have verb forms, but related to it, "theorize" is the verb's base form.

Is the word Theory is imperative?


How do we divide Theory into syllables?


What part of speech is Theory?


What is the opposite of Theory?

Fact or Practice.

What is the second form of Theory?

For the verb "theorize," it's "theorized."

How is Theory used in a sentence?

"The theory of gravity explains why objects fall towards the Earth."

Is Theory an abstract noun?


Is the Theory term a metaphor?

No, but can be used metaphorically in context.
About Author
Written by
Janet White
Janet White has been an esteemed writer and blogger for Difference Wiki. Holding a Master's degree in Science and Medical Journalism from the prestigious Boston University, she has consistently demonstrated her expertise and passion for her field. When she's not immersed in her work, Janet relishes her time exercising, delving into a good book, and cherishing moments with friends and family.
Edited by
Harlon Moss
Harlon is a seasoned quality moderator and accomplished content writer for Difference Wiki. An alumnus of the prestigious University of California, he earned his degree in Computer Science. Leveraging his academic background, Harlon brings a meticulous and informed perspective to his work, ensuring content accuracy and excellence.

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