Origin of accusative
- Middle English acusatif from Old French from Latin (cāsus) accūsātīvus (case) of accusation (mistranslation of Greek aitiātikē (ptōsis) causal (case), (case) indicating the thing caused by the verb) (from aitiā cause, also accusation, charge) from accūsātus past participle of accūsāre to accuse accuse
From American Heritage Dictionary of the English Language, 5th Edition
- First attested in the mid 15th century. From Middle English, and from Anglo-Norman accusatif, from Middle French acusatif or from Latin accūsātīvus (“of accusing”), from accūsātus, perfect passive participle of accūsō. The Latin form was mistranslated from Ancient Greek αἰτιατική (aitiatikē) + πτῶσις (ptōsis, “case of that which was caused”) from αιτία (aitia, “accusation or cause”). Akin to accuse.