thirties

from WordNet (r) 3.0 (2006)

thirties
    n 1: the time of life between 30 and 40 [syn: {thirties}, {mid-
         thirties}, {thirty-something}]
    2: the decade from 1930 to 1939 [syn: {thirties}, {1930s}]

from The Collaborative International Dictionary of English v.0.48

Thirty \Thir"ty\, n.; pl. {Thirties}.
   1. The sum of three tens, or twenty and ten; thirty units or
      objects.
      [1913 Webster]

   2. A symbol expressing thirty, as 30, or XXX.
      [1913 Webster]

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