"Demonstrance" is a word in ENGLISH

To make proof of; to demonstrate; to prove or show practically.

To demonstrate by proof or evidence; to prove.

To show, or make evident, by reasoning or proof; to prove by deduction; to establish so as to exclude the …

The act of proving by the syllogistic process, or the proof itself.

The act of demonstrating; an exhibition; proof; especially, proof beyond the possibility of doubt; indubitable evidence, to the senses or …

Not reaching the end aimed at by the most plain and direct method; as, an indirect proof, demonstration, etc.

The act of demonstrating; proof.

That degree of evidence which convinces the mind of any truth or fact, and produces belief; a test by facts …

A pointing out; manifestation; proof; demonstration.