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English definition of “certain”

certain

adjective (WITHOUT DOUBT)    /ˈsɜː.tən/ US  /ˈsɝː-/
B1 having no doubt or knowing exactly that something is true, or known to be true, correct, exact, or effective: [+ (that)] Are you absolutely certain (that) you gave them the right number? I feel certain (that) you're doing the right thing. You should make certain (that) everyone understands the instructions. The police seem certain (that) they will find the people responsible for the attack. [+ question word] I'm not certain how much it will cost. He was quite certain about/of his attacker's identity. One thing is certain - she won't resign willingly.Confidence and self-assuranceShowing arrogance and conceitCertaintyConfidence and self-assurance know/say for certain C1 to know or say something without doubt: I don't know for certain if she's coming. I can't say for certain how long I'll be there.Confidence and self-assuranceShowing arrogance and conceitCertaintyConfidence and self-assurance
(Definition of certain adjective (WITHOUT DOUBT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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