Definition of onus probandi in English:

onus probandi


  • The obligation to prove an assertion or allegation that one makes; the burden of proof.

    • ‘[The first [is], that the onus probandi lies in every case upon the party propounding a Will; and he must satisfy the conscience of the Court that the instrument so propounded is the last Will of a free and capable Testator.’
    • ‘We must go with Huxley in his contention that these rights may sometimes be displaced; but the onus probandi lies heavily on the shoulder of him who disputes that claim to possession, not on the man who seeks to defend it.’


Latin, ‘the burden of proving’.


onus probandi

/ˌōnəs prōˈbandē/