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multiplication. n. 1. (Mathematics) an arithmetical operation, defined initially in terms of repeated addition, usually written a Ã b, a.b, or ab, by which the product of two quantities is calculated: to multiply a by positive integral b is to add a to itself b times.
multiplication sign. 1. Arithmetic. the symbol (â), (Ã), or (â) between two mathematical expressions, denoting multiplication of the second expression by the first. In certain algebraic notations the sign is suppressed and multiplication is indicated by immediate juxtaposition or contiguity, as in ab.