CIDE DICTIONARY
possessive, a. [L. possessivus: cf. F. possessif.].
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.
possessive, n.
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The possessive case. [1913 Webster]
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A possessive pronoun, or a word in the possessive case. [1913 Webster]
OXFORD DICTIONARY
possessive, adj. & n.
--adj.
1 showing a desire to possess or retain what one already owns.
2 showing jealous and domineering tendencies towards another person.
3 Gram. indicating possession.
--n. (in full possessive case) Gram. the case of nouns and pronouns expressing possession.
possessive pronoun each of the pronouns indicating possession (my, your, his, their, etc.) or the corresponding absolute forms (mine, yours, his, theirs, etc.).
possessively adv. possessiveness n.
L possessivus (as POSSESS), transl. Gk ktetike (ptosis case)
THESAURUS
possessive
acquisitive, ambitious for self, autistic, careerist, controlling, covetous, dominating, domineering, egotistical, grasping, greedy, individualistic, materialistic, narcissistic, niggardly, overbearing, personalistic, possessory, privatistic, proprietary, remote, self-absorbed, self-admiring, self-advancing, self-besot, self-centered, self-considerative, self-contained, self-devoted, self-esteeming, self-indulgent, self-interested, self-jealous, self-occupied, self-pleasing, self-seeking, self-serving, self-sufficient, selfish, stingy, ungenerous, ungiving, unyielding