Pos·sess·ive a. 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.