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Definition of certain : 1. A certain number or quantity.
2. Actually existing; sure to happen; inevitable.
3. Assured in mind; having no doubts; free from suspicions concerning.
4. Certainly.
5. Certainty.
6. Determined; resolved; - used with an infinitive.
7. Fixed or stated; regular; determinate.
8. Not specifically named; indeterminate; indefinite; one or some; - sometimes used independenty as a noun, and meaning certain persons.
9. Not to be doubted or denied; established as a fact.
10. Unfailing; infallible.

Synonyms:

unerring, unperturbed, guaranteed, current, marked, safe, singular, particular, inescapable, have no doubt, unfailing, trusted, several, individual, undoubting, express, inarguable, accurate, specific, firm, authorized, secure, accredited, special, evident, hard, unambiguous, questionless, satisfied, some, undisturbed, self-confident, concluded, legitimate, unconcerned, genuine, unavoidable, change, plain, settled, determined, inevitable, make certain, especial, sure-fire, fixed, unassailable, have confidence, undisputed, infallible, unwavering, real, received, know, regular, sound, one, undisputable, authoritative, destined, feel sure, uncertain, untroubled, accepted, original, believing, specified, be confident, calm, doubtful, appreciable, precise, plastered, sealed

affirmative (part of speech: adjective)

assertive, insistent, predicative, declarative, affirmative

categorical (part of speech: adjective)

flat, denominational, typical, outright

absolute (part of speech: adjective)

indubitable, consummate, unmitigated, undeniable, unconditional, categorical, positive, absolute, definite, perfect, unrestricted, sure, supreme, complete, utter, unequivocal, unqualified, conclusive

certain (part of speech: adjective)

doubtless, irrefutable, set, confident, indisputable, veritable, trusting, convinced, clear, patent, unquestionable, decided, incontestable, assured, decisive, undoubted, steadfast, unmistakable, irrefragable, incontrovertible

true (part of speech: adjective)

gospel, authentic, right, honest, proven, true, axiomatic, factual, veracious

reliable (part of speech: adjective)

reliable, faithful, trustworthy, trusty, devoted, loyal, dependable, conscientious

Usage examples: