The meaning of CERTAINTY is something that is certain. How to use certainty in a sentence. Synonym Discussion of Certainty.

CERTAINTY definition: 1. the state of being completely confident or having no doubt about something: 2. something that…. Learn more.

CERTAINTY definition: the state of being certain. See examples of certainty used in a sentence.

Definition of certainty noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Certainty is the state of being definite or of having no doubts at all about something. I have told them with absolute certainty there'll be no change of policy.

Certainty bet one’s boots To be absolutely sure or certain of something. The reference is to a gambler (perhaps a cowboy, whose boots are among his most important possessions) so sure of winning that …

Certainty is the state of being completely confident or sure about something, a situation where there is no doubt or it is free from ambiguity. It could also refer to a situation or event that is inevitable or …

Jan 20, 2026 · certainty (countable and uncountable, plural certainties) She spoke with complete certainty. There is no certainty that the plan will succeed.

Something that is clearly established or assured. Nothing is known with certainty as to the date or author. These passages inspire a hope, but do not sustain a certainty.

cer•tain•ty (sûr′ tn tē), n., pl. -ties. the state of being certain. something certain; an assured fact. Idioms for or of a certainty, certainly; without a doubt: I suspect it, but I don't know it for a certainty.