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/serr"tn/, adj.1. free from doubt or reservation; confident; sure: I am certain he will come.2. destined; sure to happen (usually fol. by an infinitive): He is certain to be there.3. inevitable; bound to come: They realized then that war was certain.4. established as true or sure; unquestionable; indisputable: It is certain that he tried.5. fixed; agreed upon; settled: on a certain day; for a certain amount.6. definite or particular, but not named or specified: A certain person phoned. He had a certain charm.7. that may be depended on; trustworthy; unfailing; reliable: His aim was certain.8. some though not much: a certain reluctance.9. Obs. steadfast.10. for certain, without a doubt; surely: I know for certain that I have seen that face before.pron.11. certain ones: Certain of the members declined the invitation.[1250-1300; ME < OF < VL *certanus, equiv. to L cert(us) sure, settled (cer- base of cernere to decide, + -tus ptp. suffix) + -anus -AN]Syn. 1. convinced, satisfied. See sure. 4. indubitable, incontestable, irrefutable, incontrovertible, obvious, plain, clear. 5. determined.
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Universalium. 2010.