(informal) something that is a certainty, esp a horse that is certain to win a race (esp in the phrase a dead cert)
colloquial abbreviation of certain or certainty, attested from 1889.
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free from doubt or reservation; confident; sure: I am certain he will come. destined; sure to happen (usually followed by an infinitive): He is certain to be there. inevitable; bound to come: They realized then that war was certain. established as true or sure; unquestionable; indisputable: It is certain that he tried. fixed; agreed upon; […]
with certainty; without doubt; assuredly: I’ll certainly be there. yes, of course: Certainly, take the keys. surely; to be sure: He certainly is successful. adverb with certainty; without doubt: he certainly rides very well sentence substitute by all means; definitely: used in answer to questions adv. c.1300, in all main modern senses, from certain + […]
the state of being certain. something certain; an assured fact. for / of a certainty, certainly; without a doubt: I suspect it, but I don’t know it for a certainty. noun (pl) -ties the condition of being certain something established as certain or inevitable for a certainty, without doubt n. c.1300, certeynte, “surety, pledge,” from […]
abbreviation (in Britain) Certificate in Education