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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  fifties
       n 1: the decade from 1950 to 1959 [syn: 1950s]
       2: the time of life between 50 and 60 [syn: mid-fifties]