Other forms: forties
Forty is four times ten. The number that famously has no u in it.
That spelling is the trap, since four, fourth and fourteen all keep the u and forty does not, and fourty is one of the most common misspellings in English. Forty winks means a short nap. Life begins at forty is the standard consolation offered at the birthday. In the Bible almost every long period is forty days or forty years, which is a way of saying a great many.
1nounfortyThe number equal to four times ten.
“There were forty applicants for the post.”
Middle English
fourty
English, today
forty
From Middle English fourty. From Middle English fourty, forty, from Old English fēowertiġ, ultimately from Proto-Germanic fedwōr tigiwiz (“forty”). by surface analysis, four + -ty.
Etymology from Wiktionary, CC BY-SA