·noun The vocative case.
II. Vocative ·adj Of or pertaining to calling; used in calling; specifically (Gram.), used in address; appellative;
— said of that case or form of the noun, pronoun, or adjective, in which a person or thing is addressed; as, Domine, O Lord.
vŏcātīvē, adv. [vocativus], in the vocative : dicere, Gell. 13, 22, 4. ...
A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.