|Origin:||fiftig, from fif 'five'|
the number 50
2 [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.
to be aged between 50 and 59
He must be in his early fifties by now.
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
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.
her fiftieth birthday