the act of demonstrating; an exhibition; proof; especially, proof beyond the possibility of doubt; indubitable evidence, to the senses or reason.-an expression, as of the feelings, by outward signs; a manifestation; a show.-the exhibition and explanation of a dissection or other anatomical preparation.-(mil.) a decisive exhibition of force, or a movement indicating an attack.-the act of proving by the syllogistic process, or the proof itself.-a course of reasoning showing that a certain result is a necessary consequence of assumed premises; -- these premises being definitions, axioms, and previously established propositions.