Meaning

verb sing (each note a scale or in a melody) with the same vowel

verb pronounce as a vowel

verb express or state clearly

originEtymology tree Proto-Indo-European *wekʷ-der. Proto-Indo-European *wṓkʷs Proto-Italic *wōks Latin vōx Proto-Indo-European *h₂el-der.? Proto-Italic *-ālis Latin -ālis Latin vōcālisbor. Middle English vocal English vocal English -ise English vocalise From vocal + -ise.

Etymology from Wiktionary, CC BY-SA 3.0