- eighty, 80, LXXX, fourscore - the cardinal number that is the product of ten and eight
--1 is a kind of decade, decennary, decennium; large integer; decade, decennary, decennium; large integer
- eighties, 1980s - the decade from 1980 to 1989
--2 is a kind of decade, decennary, decennium; decade, decennary, decennium
- eighties, mid-eighties - the time of life between 80 and 90
--3 is a kind of time of life; time of life
--3 is a part of old age, years, age, eld, geezerhood