multiplication: n. 1 the arithmetical process of multiplying. 2 the act or an instance of multiplying. ømultiplication sign the sign (x) to indicate that one quantity is to be multiplied by another, as in 2 x 3 = 6. multiplication table a list of multiples of a particular number, usu. from 1 to 12. øømultiplicative adj. [ME f. OF multiplication or L multiplicatio (as MULTIPLY)]