gen·i·tive 
(jĕnĭ-tĭv)
(jĕnĭ-tĭv)adj.
1. Of, relating to, or being the grammatical case expressing possession, measurement, or source.
2. Of or relating to an affix or construction, such as a prepositional phrase, characteristic of the genitive case.
n.
1. The genitive case.
2. A word or form in the genitive case.
[Middle English genetif, from Latin genetīvus, from genitus, past participle of gignere, to beget; see genə- in the Appendix of Indo-European roots.]