Etymology
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fifty (adj., n.)

"1 more than forty-nine, twice twenty-five; the number which is one more than forty-nine; a symbol representing this number;" Old English fiftig "fifty; a set of fifty," from fif "five" (from PIE root *penkwe- "five") + -tig "group of ten" (see -ty (1)). Compare Old Frisian fiftich, Old Norse fimm tigir, Dutch vijftig, Old High German fimfzug, German fünfzig, Gothic fimf tigjus. U.S. colloquial fifty-fifty "in an even division" is from 1908.

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Definitions of fifty
1
fifty (n.)
the cardinal number that is the product of ten and five;
Synonyms: " / l
fifty (n.)
a United States bill worth 50 dollars;
Synonyms: fifty dollar bill
2
fifty (adj.)
being ten more than forty;
Synonyms: " / l
From wordnet.princeton.edu