compurgation
Concise Oxford English Dictionary © 2008 Oxford University Press:
compurgation /ˌkɒmpəːˈgeɪʃ(ə)n/
▶noun Law, historical acquittal from a charge or accusation obtained by statements of innocence given by witnesses under oath.
– origin C17: from med. L. compurgatio(n-), from L. compurgare, from com- (expressing intensive force) + purgare ‘purify’.
'compurgation' also found in these Oxford entries:
