adjective

(in Latin, Greek, German, and some other languages) denoting a case of nouns, pronouns, and adjectives which expresses the object of an action or the goal of motion.

In ordinary English this is a function that goes with accusative case on a pronoun: if you knock on my door and I call out Who is it?

noun

A word in the accusative case.

Recall the fictional judge objecting to splitting in court, in one of the Rumpole stories; he used an accusative in a gerund object, even for a pronoun,