1 [mass noun] the use of the voice or vocal organs in speech:his composition uses many types of vocalism from humming and whistling to invented languages
the skill or art of exercising the voice in singing:jazz vocalism has been a strong influence on popular singing [count noun]:his trademark vocalisms have helped set the standard for hard rock as we know it
2 Phonetics a vowel sound or articulation.
a system of vowels used in a given language.
vocalism in other Oxford dictionaries
Definition of vocalism in the US English dictionary