Six"ty (?), a. [AS. siextig; akin to G. sechzig, Goth. sa�xa1;hs tigjus. See Six, Ten, and cf. Sixteen.]
Six times ten; fifty-nine and one more; threescore.
© Webster 1913.
Six"ty, n.; pl. Sixties ().
1.
The sum of six times ten; sixty units or objects.
2.
A symbol representing sixty units, as 60, lx., or LX.
© Webster 1913.