Толковый словарь английского языка Oxford English Reference - fifty

n. & adj. --n. (pl. -ies) 1 the product of five and ten. 2 a symbol for this (50, l, L). 3 (in pl.) the numbers from 50 to 59, esp. the years of a century or of a person's life. 4 a set of fifty persons or things. 5 a large indefinite number (have fifty things to tell you). --adj. that amount to fifty. Phrases and idioms fifty-fifty adj. equal, with equal shares or chances (on a fifty-fifty basis). --adv. equally, half and half (go fifty-fifty). fifty-first, -second , etc. the ordinal numbers between fiftieth and sixtieth. fifty-one, -two , etc. the cardinal numbers between fifty and sixty. Derivatives fiftieth adj. & n. fiftyfold adj. & adv. Etymology: OE fiftig (as FIVE, -TY(2))