a note having one sixty-fourth of the time value of a whole note; hemidemisemiquaver.
The Mystery Behind April’s NameWhile the first day of the fourth month of the year is sure to bring plenty of shenanigans, what isn't so certain is where the month's name originated.
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British Dictionary definitions for sixty-fourth note
music, US and Canadian a note having the time value of one sixty-fourth of a semibreveAlso called (in Britain and certain other countries): hemidemisemiquaver
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012