Certain: (comparative more certain or certainer

certain (comparative more certain or certainer, superlative most certain or certainest) Sure in one's mind, positive; absolutely confident in the truth of something. synonym quotations Definition of certain adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. Learn the meaning, synonyms, and idioms of certain , an adjective that indicates confidence, truth, or inevitability. Find out how to use certain as a pronoun, determiner, or adverb, and how to modify it with degrees of certainty. Discover the meaning of certain , what certain means, and how to use certain correctly. Complete guide with definitions, examples, and usage tips.