noun
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the act, fact or state of knowing well; deep knowledge.
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the act or the process of remembering; the act of recollecting; a calling back to mind; remembrance.
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a sign, indication, symbol or a thing that helps recollecting the past.
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something presented in a legal proceeding, as a statement of a witness, an object, etc., which bears on or establishes a point in question; an evidence; a proof.