Asseveration

ASSEVERATION. 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.