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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.
of or relating to commutation, exchange, substitution, or interchange. 2. Mathematics. (of a binary operation) having the property that one term operating on a second is equal to the second operating on the first, as a Ã b = b Ã a. having reference to this property: commutative law for multiplication.