Pronunciation: (vō'ku-liz"um), [key]
a. a vowel, diphthong, triphthong, or vowel quality, as in a syllable.
b. the system of vowels of a language.
2. the use of the voice, as in speech or song.
3. the act, principles, or art of singing.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.