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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.
Definition of multiplication for Students. : a short way of finding out what would be the result of adding one number the number of times indicated by a second number The multiplication of 7 by 3 is equal to 7 plus 7 plus 7, which gives 21.