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English definition of “certain”

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certain

adjective  /ˈsɜr·tən/ us  

certain adjective (KNOWING TO BE TRUE)

knowing that something is true or will happen and having no cause to feel that it may not be true or may not happen; having no doubt: "I think Emily is going to pick up Judy." "Are you certain?" One thing is certain – supporters of the bill are not giving up. [+ (that) clause] I’m certain (that) he’ll be there. [+ question word] I’m not certain how much it will cost. When you report a robbery, make certain a police report is filled out (= check that this happens).

certain adjective (PARTICULAR)

particular but not named or described: Parents expect their kids to leave home at a certain point.

certain adjective (LIMITED)

[not gradable] some but not exactly stated; limited: She enjoys sports to a certain extent. There’s a certain amount of exaggeration in all ads.
certain
pronoun  /ˈsɜrt·ən/ us  
Charges were filed against certain of the company’s directors.
(Definition of certain from the Cambridge Academic Content Dictionary © Cambridge University Press)
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