|Origin:||feowertig, from feower 'four'|
the number 40
2 [plural] also the '40s, the 1940s
the years from 1940 to 1949:
The place was built as a casino in the forties.
the early/mid/late forties
He spent several years in Paris in the late forties.
to be aged between 40 and 49
The woman was probably in her mid forties.
if the temperature is in the forties, it is between 40 degrees and 49 degrees
in the low/mid/high forties
The temperature was up in the high forties.
her fortieth birthday