What is the meaning of Vocative?

Of or pertaining to calling; used in calling or vocation.

Used in address; appellative (said of that case or form of the noun, pronoun, or adjective, in which a person or thing is addressed). For example "Domine, O Lord"

The vocative case

A word in the vocative case

Something said to (or as though to) a particular person or thing; an entreaty, an invocation.

feminine plural of vocativo

vocative masculine singular of vocātīvus

plural of vocativ

Source: wiktionary.org