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theories

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.

Under standard theories, planets form within giant discs of gas and dust called protoplanetary discs.

From Science Daily • May 21, 2026

Researchers did not immediately conclude that existing planet formation theories were wrong.

From Science Daily • May 21, 2026

That includes “how agencies allocate resources, the types of cases emphasized, how aggressively certain theories are pursued, and how the government frames its enforcement mission publicly.”

From MarketWatch • May 20, 2026

The scientists suggested several theories for why these two humpbacks embarked on such "exceptional" deviations from the normal routes.

From Barron's • May 20, 2026

William had to work closely with officers who believed in these theories.

From "The Woman All Spies Fear" by Amy Butler Greenfield