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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.
Matrix multiplication. Multiply two matrices together. They can be of any dimensions, so long as the number of columns of the first matrix is equal to the number of rows of the second matrix.