Webster's Revised Unabridged Dictionary · 1913

Sixty

Sixty , adjective

[Anglo-Saxon siextig; akin to German sechzig, Gothic saíhs tigjus. See Six, Ten, and compare Sixteen.]

Six times ten; fifty-nine and one more; threescore.

Sixty ({not transcribed}) , noun

1.
The sum of six times ten; sixty units or objects.
2.
A symbol representing sixty units, as 60, lx., or LX.