Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: eahtatig, from eahta 'eight'

eighty

 number
     
Related topics: Numbers
eigh‧ty
1HMN the number 80
2

the eighties

[plural] also the '80s, the 1980s the years from 1980 to 1989:
The band was incredibly successful in the eighties.
the early/mid/late eighties
Their troubles began in the mid eighties.
3

be in your eighties

to be aged between 80 and 89
early/mid/late eighties
Hilda Simpson was a woman in her early eighties.
4

in the eighties

if the temperature is in the eighties, it is between 80 degrees and 89 degrees
in the low/mid/high eighties
The temperature is expected to remain in the low eighties.
—eightieth adjective:
her eightieth birthday
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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