Onus probandi Term Onus probandi Meaning Burden of proof; the obligation of a party to provide evidence to prove their claim. Context Legal maxim More from Legal Maxims Novation Nullum crimen sine lege, nulla poena sine lege Nunc pro tunc Obiter dictum Pacta Sunt Servanda Palimony Pari passu Particeps criminis More from Legal Maxims