Actori Incumbit Onus Probandi Law and Legal Definition

Actori incumbit onus probandi is a legal maxim in Latin. It means ‘the burden of proof is on the plaintiff.’

Every plaintiff at law or complainant at equity, must show a good title or claim before he can prevail in his suit, conformably to the maxim, "actori incumbit onus probandi.” [Murfree's Lessee v. Logan, 2 Tenn. 220, 224 (Tenn. 1814)].