'Sixty-fourth note' definitions:

Definition of 'sixty-fourth note'

From: WordNet
noun
A musical note having the time value of a sixty-fourth of a whole note [syn: sixty-fourth note, hemidemisemiquaver]

Definition of 'Sixty-fourth note'

From: GCIDE
  • Sixty-fourth \Six`ty-fourth"\, a. Constituting or being one of sixty-four equal parts into which a thing is divided. [1913 Webster]
  • Sixty-fourth note (Mus.), the sixty-fourth part of a whole note; a hemi-demi-semiquaver. [1913 Webster]