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English definition of “certain”

certain

adjective     /ˈsɜːtən/
NO DOUBT [never before noun] B1 completely sure of something, or knowing without doubt that something is true : [+ (that)] I feel absolutely certain that you're doing the right thing. [+ question word] Nobody was certain how the accident had happened . He was quite certain about/of the thief's identity . → Opposite uncertainCertaintyConfidence and self-assurance
know/say for certain to know something without doubt : We don't know for certain whether she's coming.CertaintyConfidence and self-assurance
SURE TO HAPPEN B1 sure to happen , to do something, or to be true : [+ (that)] It now looks certain that she will resign . [+ to do sth] She is certain to do well UK in the exams / US on the exams . How can we make certain that (= do something to be sure that) she sees the note ? One thing is certain. Her attacker knew where she lived .CertaintyConfidence and self-assurance
PARTICULAR [always before noun] B1 used to refer to a particular person or thing without naming or describing them exactly : The museum is only open at certain times of the day . Certain people react badly to these drugs .Particular and individual
a certain B2 used before a noun to mean existing , but difficult to describe the exact quality or amount : He's got a certain charm . You have to have a certain amount of courage to perform in public .Particular and individual
certain of formal used to refer to some of a group of people or things: Certain of you already know the news .Some and quite
(Definition of certain adjective from the Cambridge Learner's Dictionary © Cambridge University Press)

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