'Sixties' definitions:

Definition of 'sixties'

From: WordNet
noun
The decade from 1960 to 1969 [syn: sixties, 1960s]
noun
The time of life between 60 and 70 [syn: sixties, mid- sixties]

Definition of 'Sixties'

From: GCIDE
  • Sixty \Six"ty\, n.; pl. Sixties.
  • 1. The sum of six times ten; sixty units or objects. [1913 Webster]
  • 2. A symbol representing sixty units, as 60, lx., or LX. [1913 Webster]