Meaning

noun the cardinal number that is the product of ten and five

noun a United States bill worth 50 dollars

adjective being ten more than forty

originPIE word *pénkʷe Etymology tree Proto-Indo-European *pénkʷe Proto-Germanic *fimf Proto-Germanic *tigiwiz Proto-Germanic *fimf tigiwiz Old English fīftiġ Middle English fifty English fifty From Middle English fifty, from Old English fīftiġ, from Proto-Germanic *fimf tigiwiz (“five tens”). By surface analysis, five + -ty.

Etymology from Wiktionary, CC BY-SA 3.0