Entry 1 sense Webster, 1913 Hemi-demi-semiquaver · Hem·i-dem·i-sem·i·quaver · IPA 01 n. A short note, equal to one fourth of a semiquaver, or the sixty-fourth part of a whole note. 1. A short note, equal to one fourth of a semiquaver, or the sixty-fourth part of a whole note.(Mus.)