fif·ty /ˈfɪfti/
  num(a.)五十,50個;許多的
  fifty
  超50表示法
  Fif·ty, n.; pl. Fifties
  1. The sum of five tens; fifty units or objects.
  2. A symbol representing fifty units, as 50, or l.
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  Fif·ty a.  Five times ten; as, fifty men.
  fifty
       adj : being ten more than forty [syn: 50, l]
       n 1: the cardinal number that is the product of ten and five
            [syn: 50, L]
       2: a United States bill worth 50 dollars [syn: fifty dollar
          bill]