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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.

Supporters love the "madman theory" for its ability to keep opponents off guard and pull off previously unthinkable achievements.

From BBC • Apr. 8, 2026

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

From Science Daily • Apr. 8, 2026

In 1997, the California Supreme Court pronounced the theory “utterly without merit.”

From The Wall Street Journal • Apr. 7, 2026

Critically, Cembalest’s argument in support of this conclusion doesn’t rest on theory or conjecture.

From MarketWatch • Apr. 6, 2026

Whatever the scientific theory, I loved the idea of creating my own mini twinkling star, even if it only lasted for a microsecond.

From "Sir Fig Newton and the Science of Persistence" by Sonja Thomas