Vocalise to; Vocalisation

VOCALISE, TO; VOCALISATION. To vocalise is, as its name implies, to sing upon a vowel, whether one note or a series of notes, in contradistinction to singing to separate syllables. Vocalisation is therefore one part of the operation of pronunciation, the other being articulation. Perfect vocalisation involves purity of whatever vowel-sound is at the moment being sung, and this purity of course requires that only those parts of the organs of speech be called into action that are absolutely necessary...