multiplicative identity

noun

: an identity element (such as 1 in the group of rational numbers without 0) that in a given mathematical system leaves unchanged any element by which it is multiplied

Word History

First Known Use

1958, in the meaning defined above

Kids Definition

multiplicative identity

noun

: an element of a set that when multiplied by any other element of the set leaves the element unchanged

the number 1 is a multiplicative identity in the set of real numbers