From Longman Dictionary of Contemporary Englishfiftyfif‧ty /ˈfɪfti/ ●●● S3 W3 number, noun 1 HMNthe number 502 → the fifties3 → be in your fifties4 → in the fifties5 PEC[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 birthdayOrigin fifty Old English fiftig, from fif “five”
