DEMONSTRATION, n. 1. The act of demonstrating, or of exhibiting certain proof. 2. The highest degree of evidence; certain proof exhibited, or such proof as establishes a fact or proposition beyond a possibility of doubt, or as shows the contrary position to be absurd or impossible. 3. Indubitable evidence of the senses, or of reason; evidence which satisfies the mind of the certainty of a fact or proposition. Thus we hold that the works of nature exhibit demonstration of the existence of a God. 4. In logic, a series of syllogisms, all whose premises are either definitions, self-evident truths, or propositions already established.