- forty, 40, XL - the cardinal number that is the product of ten and four
--1 is a kind of time of life; large integer; time of life; large integer
--1 is a part of adulthood, maturity - forties, 1940s - the decade from 1940 to 1949
--2 is a kind of decade, decennary, decennium; decade, decennary, decennium