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Definitions

theory

[thee-uh-ree, theer-ee] / ˈθi ə ri, ˈθɪər i /
NOUN
hypothesis, belief
Synonyms
STRONGEST
approach argument assumption code concept doctrine idea ideology method philosophy plan position premise proposal provision rationale scheme speculation suspicion system thesis understanding
STRONG
base basis codification conditions conjecture dogma feeling foundation grounds guess guesswork hunch impression outlook postulate presentiment presumption shot stab supposal supposition surmise theorem
WEAK
formularization suppose systemization
Antonyms
STRONGEST
disbelief fact information reality truth
STRONG
calculation knowledge measurement proof
WEAK
certainty

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"The latest theory is related to some of the chemistry that goes into ensuring that the wastewater doesn't develop any biofilms," or microorganisms, he said.

From Barron's • Apr. 9, 2026

They have not yet been directly observed, but they are predicted by theory.

From Science Daily • Apr. 8, 2026

The theory was he would no longer be tied down by the burden of his own expectation and quickly produce more major victories now his 11-year fallow period had finally ended.

From BBC • Apr. 7, 2026

If you do a good turn for others, the universe will — in theory — do you a good turn one day.

From MarketWatch • Apr. 7, 2026

Unfortunately, tendenko is easier to follow in theory than in reality.

From "Meltdown" by Deirdre Langeland