eighty · NUMBER /ˈeɪt̬.i/
eighty
A2 the number 80
Dictionary examples:
seventy, eighty, ninety
They've invited eighty (guests) to the wedding.
Learner example:
The film is a fantasy novel and it [was] written by Tolkien about eighty years ago. (Preliminary English Test; B1; Italian)
(be) in your eighties/80s
B2 to be aged between 80 and 89
Dictionary example:
Many of the residents are in their eighties.
the eighties/'80s
B2 the years 1980 through 1989
Dictionary example:
They moved to Georgia in the eighties.
Learner example:
He is a normal man with no special education, but he became famous during the eighties as a musician. (First Certificate in English; B2; German)