adjective
Of or pertaining to calling; used in calling or vocation.
(grammar) Used in address; appellative; said of the case or form of the noun, pronoun, or adjective by which a person or thing is addressed.
noun
(grammar) The vocative case
(grammar) A word in the vocative case
(grammar) A vocative expression
(rare) Something said to (or as though to) a particular person or thing; an entreaty, an invocation.