fifty

noun

fif·​ty ˈfif-tē 

plural fifties

1

: a number equal to five times 10 see Table of Numbers

2

fifties plural : the numbers 50 to 59

specifically : the years 50 to 59 in a lifetime or century

3

: a 50-dollar bill

fiftieth

ˈfif-tē-əth 

adjective or noun

fifty adjective

fifty pronoun, plural in construction

fiftyish

ˈfif-tē-ish 

adjective

Examples of fifty in a Sentence

She is in her fifties.

The bill for dinner came to $43, and she gave him a fifty.

Recent Examples on the Web

In the late fifties and early sixties the Method was the rage, especially among the young actors of about Willy’s age, who all idolized Marlon Brando and would go on to transform American cinema in a few years: Warren Beatty, Al Pacino, Dustin Hoffman, and so on. —Benjamin Hale june 23, Literary Hub, 23 June 2025

An ex-marine officer during the late fifties, his business leadership style was swashbuckling, colorful, and highly focused. —Chip Bell, Forbes.com, 18 June 2025

On Instagram, Schmitt shares clips from her longer videos and some original content as well — including OOTD posts and sneak-peeks into her own fabulous fifties. —Carmen Rios, Flow Space, 7 July 2025

His overseas average in New Zealand, South Africa, Australia and England comes to just under 26 with two fifties in 11 Tests. —Tim Ellis, Forbes.com, 19 June 2025

Word History

Etymology

Middle English, from fifty, adjective, from Old English fīftig, from fīftig, noun, group of 50, from fīf five + -tig group of ten; akin to tīen ten

First Known Use

before the 12th century, in the meaning defined at sense 1

Phrases Containing fifty

• fifty-fifty

Rhymes for fifty

• nifty
• shifty
• thrifty
• unthrifty

Kids Definition

fifty

noun

fif·​ty ˈfif-tē 

plural fifties

: a number equal to five times 10 see number

fiftieth

-tē-əth 

adjective or noun

fifty adjective or pronoun