Definition of sixty-fourth note in US English:
 sixty-fourth note
nounˈsikstē fôrTH nōtˈsɪksti fɔrθ noʊt
North American Music A note with the time value of half a thirty-second note, represented by a large dot with a four-flagged stem.
 Example sentencesExamples
-  While it is refreshing to see the rhythms left gracefully intact, they include micro-divisions of thirty-second and sixty-fourth notes, not rhythms with which the average beginner is terribly familiar.
 -  I take two or three notes and play them as fast as I can, using thirty-second notes and sixty-fourth notes.
 -  The tick value is one sixty-fourth of the total duration of a measure, or a sixty-fourth note in musical terms.
 -  Here, I think, it is unnecessary to make a clear contrast between the thirty-second and sixty-fourth notes, but treat them as ten roughly equivalent notes that start slowly and then get slightly faster.
 -  It is only a sixty-fourth note short of full value!