Original Article: "ASSEVERATION" http://legal-dictionary.thefreedictionary.com/asseveration
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The proof which a man gives of the truth of what be says, by appealing to his conscience as a witness. It differs from an oath in this, that by the latter he appeals to God as a witness of the truth of what he says, and invokes him as the avenger of falsehood and perfidy, to punish him if he speak not the truth. Vide Affirmation; Oath; and Merl. Quest. de Droit, mot Serment.
A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.