vocative

/หˆvษ’kษ™tษชv/
noun
  1. 1

    (grammar) The vocative case

  2. 2

    (grammar) A word in the vocative case

  3. 3

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

adjective
  1. 1

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

  2. 2

    (grammar) 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"

Source: https://en.wiktionary.org/wiki/vocative