fifty

American  

[fif-tee] / ˈfɪf ti /

noun

fifties plural

1. a cardinal number, ten times five.

2. a symbol for this number, as 50 or L.

3. a set of this many persons or things.

4. fifties, the numbers, years, degrees, or the like, from 50 through 59, as in referring to numbered streets, indicating the years of a lifetime or of a century, or degrees of temperature.

   She lives in the East Fifties. He's in his late fifties. It's going to be in the fifties again today.

5. Informal. a fifty-dollar bill.

   He had a fifty and two tens in his wallet.

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adjective

1. amounting to 50 in number.

fifty British  

/ ˈfɪftɪ /

noun

1. the cardinal number that is the product of ten and five

2. a numeral, 50, L, etc, representing this number

3. something represented by, representing, or consisting of 50 units

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determiner

1. 1. amounting to fifty

      fifty people

   2. ( as pronoun )

      fifty should be sufficient

Other Word Forms

Noun Inflected Forms

• fifties
  plural

Etymology

Origin of fifty

before 900; Middle English; Old English fīftig. See five, -ty ¹

Example Sentences

Fifty analysts cover Tesla stock, according to FactSet.

From Barron's • Jul. 1, 2026

Fifty years and thousands of runs later, six of the original players still take to the diamond nearly every Sunday, swinging for the fences.

From Los Angeles Times • Jun. 26, 2026

The boom-and-bust Nifty Fifty stocks of the early 1970s, long trotted out as a cautionary tale of falling in love with one group, weren’t so bad.

From The Wall Street Journal • Jun. 24, 2026

Fifty years ago, the Supreme Court reinstated the death penalty as constitutionally permissible in the landmark case Gregg v.

From Slate • Jun. 11, 2026

Fifty divided by two is twenty-five, I think.

From "Muffled" by Jennifer Gennari