Vocative \Voc"a*tive\, n. [L. vocativus (sc. casus): cf. F. vocatif.]

(Gram.) The vocative case.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Vocative \Voc"a*tive\, a. [L. vocativus, fr. vocare to call.]

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.

Source: Webster's Revised Unabridged Dictionary (1913)