- a cardinal number, ten times five.
- a symbol for this number, as 50 or L.
- a set of this many persons or things.
- 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.
- a fifty-dollar bill: He had a fifty and two tens in his wallet.
- amounting to 50 in number.
- the cardinal number that is the product of ten and five
- a numeral, 50, L, etc, representing this number
- something represented by, representing, or consisting of 50 units
- amounting to fifty
- (as pronoun)
