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certain

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Certain describes being absolutely sure of something, or something you are confident about. The word certain can also be used to identify someone ("that certain person") who isn't explicitly named when it is clear who you are talking about. (adjective)

An example of certain is when you are confident that you let the dogs in earlier.
An example of certain is how you would identify someone without his name even though everyone knows who you are talking about.

See certain in Webster's New World College Dictionary