compurgation
/ˌkɒmpɜːˈgeɪʃən/noun
mass noun
- Law, historical acquittal from a charge or accusation obtained by statements of innocence given by witnesses under oath【律】〈史〉宣誓断讼法, 宣誓免责（根据证人宣誓宣告被告无罪）。
词源
mid 17th cent.: from medieval Latin compurgatio（n-）， from Latin compurgare, from com- (expressing intensive force)+purgare 'purify' （from purus 'pure'）.