- thirty, 30, XXX - the cardinal number that is the product of ten and three
--1 is a kind of time of life; large integer; time of life; large integer
--1 is a part of adulthood, maturity - thirties, 1930s - the decade from 1930 to 1939
--2 is a kind of decade, decennary, decennium; decade, decennary, decennium