vocative case

English Thesaurus

1. the case (in some inflected languages) used when the referent of the noun is being addressed (noun.communication)

hypernym	:	oblique, oblique case,
definition	:	any grammatical case other than the nominative (noun.communication)

derivation	:	vocative,
definition	:	relating to a case used in some languages (adj.pert)

derivation	:	vocative,
definition	:	relating to a case used in some languages (adj.pert)