genitive

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Of, relating to, or being the grammatical case expressing possession, measurement, or source.
• adjective Of or relating to an affix or construction, such as a prepositional phrase, characteristic of the genitive case.
• noun The genitive case.
• noun A word or form in the genitive case.

from The Century Dictionary.

• Connected with or relating to generation.
• In grammar, pertaining to or indicating origin, source, possession, and the like: an epithet applied to a case in the declension of nouns, adjectives, pronouns, etc., which in English is called the possessive case, or to the relation expressed by such a case: as, patris, ‘of a father, a father's,’ is the genitive case of the Latin noun pater, a father.
• noun In grammar, a case in the declension of nouns, adjectives, pronouns, etc., expressing in the widest sense a relation of appurtenance between one thing and another, an adjectival relation of one noun to another, or more specifically source, origin, possession, and the like; in English grammar, the possessive case.
• noun Abbreviated genitive

from the GNU version of the Collaborative International Dictionary of English.

• noun (Gram.) The genitive case.
• noun a construction in Greek similar to the ablative absolute in Latin. See Ablative absolute.
• adjective (Gram.) Of or pertaining to that case (as the second case of Latin and Greek nouns) which expresses source or possession. It corresponds to the possessive case in English.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective grammar Of or pertaining to that case (as the second case of Latin and Greek nouns) which expresses origin or possession. It corresponds to the possessive case in English.
• noun grammar, uncountable An inflection pattern (of any given language) that expresses origin or ownership and possession.
• noun grammar, countable A word inflected in the genitive case; a word indicating origin, ownership or possession.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective serving to express or indicate possession
• noun the case expressing ownership