VOCATIVECASE
Vocative case
The vocative case is the case used for a noun that identifies a person being addressed or, occasionally, the determiners of that noun. A vocative expression is an expression of direct address where the identity of the party spoken to is set forth expressly within a sentence. For example, in the sentence, "I don't know, John," John is a vocative expression that indicates the party being addressed—as opposed to the sentence, "I don't know John," where John is the direct object of the verb "know."The above text is a snippet from Wikipedia: Vocative case
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vocative case
Noun
- case of address, case used for a noun identifying the person or thing being addressed. It corresponds to the archaic English particle "O" as used in solemn or poetic address: Hear me, O Albion! Languages that regularly employ the vocative include Arabic, Czech, Georgian, Greek, Hawaiian, Hindi, Irish, Latin, Lithuanian, Ojibwe, Polish, Romanian, Sanskrit, Serbo-Croatian, and Ukrainian.
The above text is a snippet from Wiktionary: vocative case
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