1. (n.) The act of confirming, as the corroboration of an argument, or of information\.

2. (n.) That which corroborates.

John Hancock OK Parthian shot a priori principle acceptance accord acquiescence address admission affidavit affirmance affirmative affirmative voice agreement allegation answer apostrophe approbation approval apriorism assent assertion asseveration assumed position assumption attest attestation authentication authorization averment avouchment avowal axiom aye backing backing up basis bearing out blessing bolstering buttressing categorical proposition certification circumstantiation comment compliance compurgation confirmation connivance consent corroboration corroboratory evidence countersignature crack data declaration deposition dictum disclosure documentation eagerness endorsement exclamation expression first principles fortification foundation go-ahead green light greeting ground hypothesis hypothesis ad hoc imprimatur instrument in proof interjection legal evidence lemma major premise mention minor premise nod notarization notarized statement note observation okay permission philosopheme philosophical proposition phrase position postulate postulation postulatum premise presupposition profession promptitude promptness pronouncement proof proposition propositional function proving proving out question ratification readiness reflection reinforcement remark rubber stamp sanction say saying seal sentence sigil signature signet stamp stamp of approval statement statement under oath strengthening subjoinder submission subscription substantiation sumption support supporting evidence supposal swearing sworn evidence sworn statement sworn testimony testimonial testimonium testimony the nod theorem thesis thought truth table truth-function truth-value undergirding ungrudgingness unloathness unreluctance utterance validation verification visa vise vouching warrant willingness witness word