voc·a·tive ˈvä-kə-tiv
1
: of, relating to, or being a grammatical case (see case entry 1 sense 3a) marking the one addressed (such as Latin Domine in miserere, Domine "have mercy, O Lord")
2
of a word or word group : marking the one addressed (such as mother in "mother, come here")
vocatively adverb
1
: the vocative case of a language
2
: a form in the vocative case
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Merriam-Webster unabridged



