1. [n]  the case (in some inflected languages) used when the referent of the noun is being addressed
2. [adj]  (linguistics) relating to a case used in some languages; "vocative verb endings"

VOCATIVE is a 8 letter word that starts with V.

1. \Voc"a*tive\, a. [L. vocativus, fr. vocare to call.]
   Of or pertaining to calling; used in calling; specifically
   (Gram.), used in address; appellative; -- said of that case
   or form of the noun, pronoun, or adjective, in which a person
   or thing is addressed; as, Domine, O Lord.
   
   

2. \Voc"a*tive\, n. [L. vocativus (sc. casus): cf. F.
   vocatif.] (Gram.)
   The vocative case.