noun Date: 1958 an identity element (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
MULTIPLICATIVE IDENTITY
Meaning of MULTIPLICATIVE IDENTITY in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012