The validation of a proposition by application of specified rules, as of induction or deduction, to assumptions, axioms, and sequentially derived conclusions, The presentation of sufficient evidence_ as, the burden of proof lies with the plaintiff, The state of having been tested and approved; firmness, hardness, or impenetrability_ specifically applied to arms or armor of defense, to note that they have been duly tested and are impenetrable, intransitive verb_ To work (dough) into proper lightness, To make a trial impression of (printed or engraved matter), To become properly light for cooking, adjective_ Used to proofread or correct typeset copy, Of standard alcoholic strength, Fully or successfully resistant; impervious. Often used in combination