noun
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he who sees, percevies, notices, etc.
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the act of seeing, perceiving or noticing; he who explains, elucidates, clarifies, etc.
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the act or process of explaining or elucidating.
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a man who presents the programmemes on radio or television.
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(math.) a number or algebraic symbol prefixed as a multiplier to a variable or unknown quantity (Ex.: x in x(a-b)).