Grammar. (in certain inflected languages, as Latin, Greek, or Russian) noting a case whose distinctive function is to indicate the direct object of a verb or the object of certain prepositions. similar to such a case form in function or meaning.
Linguistics. pertaining to a type of language in which there is an accusative case or in which subjects of transitive verbs behave the same way as subjects of intransitive verbs. Compare ergative (def 2).