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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.
The multiplication of two whole numbers is equivalent to adding as many copies of one of them, as the value of the other one: For example, 3 multiplied by 4 (often said as 3 times 4) can be calculated by adding 3 copies of 4 together: Here 3 and 4 are the factors and 12 is the product.