a. [ AS. siextig; akin to G. sechzig, Goth. saíhs tigjus. See Six, Ten, and cf. Sixteen. ] Six times ten; fifty-nine and one more; threescore. [ 1913 Webster ]
n.;
a. Constituting or being one of sixty-four equal parts into which a thing is divided. [ 1913 Webster ]
Sixty-fourth note (Mus.),