The Collaborative International Dictionary
Compurgation \Com`pur*ga"tion\, n. [L. compurgatio, fr. compurgare to purify wholly; com- + purgare to make pure. See Purge, v. t.]
(Law) The act or practice of justifying or confirming a man's veracity by the oath of others; -- called also wager of law. See Purgation; also Wager of law, under Wager.
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Exculpation by testimony to one's veracity or innocence.
He was privileged from his childhood from suspicion of incontinency and needed no compurgation.
--Bp. Hacket.
Wiktionary
n. (context now chiefly historical English) Acquitting someone from a formal charge or accusation following the sworn oaths of a number of other people; vindication.
Wikipedia
Compurgation, also called wager of law and oath-helping, was a defence used primarily in medieval law. A defendant could establish his innocence or nonliability by taking an oath and by getting a required number of persons, typically twelve, to swear they believed the defendant's oath. From Latin, com = with, purgare = make clean, cleanse, excuse. Latin com is also an intensifier and turns a word into the superlative form, so compurgation, by etymology, means 'to thoroughly clean or excuse'.
The wager of law was essentially a character reference, initially by kin and later by neighbours (from the same region as the defendant), often 11 or 12 men, and it was a way to give credibility to the oath of a defendant at a time when a person's oath had more credibility than a written record. It can be compared to legal wager, which is the provision of surety at the beginning of legal action to minimize frivolous litigation.
Compurgation was found in early Germanic law, in early French law (très ancienne coutume de Bretagne), in Welsh law, and in the English ecclesiastical courts until the seventeenth century. In common law it was substantially abolished as a defence in felonies by the Constitutions of Clarendon in 1164. The defence was still permitted in civil actions for debt and vestiges of it survived until its statutory repeal at various times in common law countries: in England in 1833, and Queensland at some point before the Queensland Common Practice Act of 1867 which makes direct reference to the abolition of wager of law.
"Wager of Law, obsolete for centuries" was "a living fossil... a dead letter statute" and was repealed in England in 1833.
Usage examples of "compurgation".
The Norman kings, indeed, had introduced into England a new method of deciding doubtful questions of property by the "recognition" of sworn witness instead of by the English process of compurgation or ordeal.