(a.) Of or pertaining to a preposition; of the nature of a preposition.

abessive ablative accusative adessive adjectival adverbial allative approximative attributive case common case conjunctive copulative correct dative delative elative essive formal functional genitive glossematic grammatic illative inessive instrumental intransitive lative linking local case locative nominal nominative objective case oblique case participial perlative possessive case postpositional pronominal structural subject case sublative substantive superessive syntactic tagmemic terminative transitive translative verbal vocative