eighty · number
(be) in your eighties/80s
B2 to be aged between 80 and 89
Dictionary examples:
Many of the residents are in their eighties. (34.1)
the eighties/'80s
B2 the years 1980 through 1989
Dictionary examples:
They moved to Georgia in the eighties. (22.1)
eighty
A2 the number 80
Dictionary examples:
The teacher gave us eighty math problems. Is she crazy? (0.0)
I waited eighty minutes for the bus. I could have walked! (0.0)
My phone battery is at eighty percent. Time to charge it! (0.0)
seventy, eighty, ninety (4.2)
They've invited eighty (guests) to the wedding. (26.9)