Noun
The exercise of the vocal organs; vocalization.
A vocalic sound.
Source: Webster's dictionaryOne of the illustrious disciples of the famed, Kirana Gharana, hallowed by such great luminaries like its styliser Abdul Karim Khan and his own legendary mentor Rambhau Kundagolkar, better known as Sawai Gandharva, Bhimsen by his stentorian vocalism lent a new dimension to the gharana. Bhimsen Joshi
This suggests that, for these verbs in particular, the active originates in the PIE sigmatic aorist (with s suffix and ē vocalism) while the mediopassive stems from the PIE perfect (with o vocalism). Source: Internet
The imperative classes tend to share the same suffix as the corresponding preterite (if any), but to have root vocalism that matches the vocalism of a verb's subjunctive. Source: Internet
In 1938, George S. Lane remarked of Tocharian that "the vocalism so far has defied almost every attempt that has been made to bring it to order", Lane, George S. "Problems of Tocharian Phonology". Source: Internet