Genitive a. : 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.

Genitive n. : The genitive case.

Example:
When counting between 2 - 4 Russian adjectival nouns do you use the plural Genitive as opposed to the single ?

Taxonomy
genitive, genitive case, possessive, English, pronouns, possession, marker, languages, possessor, Adverbial genitive, Finnish, music, Objective genitive, sentences, relationships, accusative, wife, king of Sparta.

Defination from the web:
genitive case (also called the possessive case or second case) is the case that marks a noun as modifying another noun. ... Many languages have a genitive case, including Albanian, Arabic, Armenian, Basque, Czech, Estonian, Finnish, Georgian, German, Greek, Icelandic, ...