Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: fiftig, from fif 'five'

fifty

 number, noun
     
Related topics: Numbers, Currencies
fif‧ty
1HMN the number 50
2

the fifties

[plural] also the '50s the 1950s the years between 1950 and 1959:
Standards of living rose in the fifties.
the early/mid/late fifties
The play was written in the late fifties.
3

be in your fifties

to be aged between 50 and 59
early/mid/late fifties
He must be in his early fifties by now.
4

in the fifties

if the temperature is in the fifties, it is between 50 degrees and 59 degrees
in the low/mid/high fifties
sunny, with temperatures in the mid fifties
5PEC [countable] a piece of paper money that is worth 50 dollars or 50 pounds:
I can give you five tens for that fifty if you want.
—fiftieth adjective:
her fiftieth birthday
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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