from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. the burden of proof, the onus; the duty of a party in a legal proceeding to prove an assertion of fact; it includes both the burden of production and the burden of persuasion.
from the GNU version of the Collaborative International Dictionary of English
- n. obligation to furnish evidence to prove a thing; the burden of proof.
From onus ("burden") and probandī ("of proof"), the genitive of probandus ("proof"). Literally meaning "burden of proof". (Wiktionary)