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Nouns of address (technically called vocatives, but also known as nominatives of address or nouns of direct address) identify the person or group being directly spoken to. Like interjections, they are grammatically unrelated to the rest of the sentence—that is, they don’t modify or affect any other part of it. Instead, they are used to let the listener or reader know who you are addressing, or to get that person’s attention.
vocative(vŏk`ətĭv) [Lat.,=calling], in the grammar of certain languages (e.g., Latin), the casecase,
in language, one of the several possible forms of a given noun, pronoun, or adjective that indicates its grammatical function (see inflection); in inflected languages it is usually indicated by a series of suffixes attached to a stem, as in Latin amicus,
..... Click the link for more information. referring to a person addressed. In English a special intonation expresses the vocative, as in Look, Jack.