Source : Webster's Revised Unabridged Dictionary (1913)

Possessive \Pos*sess"ive\, a. [L. possessivus: cf. F.
   possessif.]
   Of or pertaining to possession; having or indicating
   possession.

   {Possessive case} (Eng. Gram.), the genitive case; the case
      of nouns and pronouns which expresses ownership, origin,
      or some possessive relation of one thing to another; as,
      Homer's admirers; the pear's flavor; the dog's
      faithfulness.

   {Possessive pronoun}, a pronoun denoting ownership; as, his
      name; her home; my book.

Source : WordNet®

possessive case
     n : the case expressing ownership [syn: {genitive}, {genitive
         case}]