Source : Webster's Revised Unabridged Dictionary (1913)

Possessive \Pos*sess"ive\, n.
   1. (Gram.) The possessive case.

   2. (Gram.) A possessive pronoun, or a word in the possessive
      case.

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
     adj 1: serving to express or indicate possession; "possessive
            pronouns"; "the genitive endings" [syn: {genitive}]
     2: desirous of owning; "small children are so possessive they
        will not let others play with their toys"
     3: having or showing a desire to control or dominate; "a
        possessive parent"