the act or circumstance of proving or being proved conclusively, as by reasoning or a show of evidence

a belief incapable of demonstration.

something serving as proof or supporting evidence

They sent a check as a demonstration of their concern.

a description or explanation, as of a process, illustrated by examples, specimens, or the like

a demonstration of methods of refining ore.

the act of exhibiting the operation or use of a device, machine, process, product, or the like, as to a prospective buyer.

an exhibition, as of feeling; display; manifestation

His demonstration of affection was embarrassing.

a public exhibition of the attitude of a group of persons toward a controversial issue, or other matter, made by picketing, parading, etc.

a show of military force or of offensive operations made to deceive an enemy.

Mathematics . a logical presentation of the way in which given assumptions imply a certain result; proof.

noun

concealment , hiding

noun

affirmation , confirmation , description , evidence , exhibition , explanation , exposition , expression , illustration , induction , manifestation , presentation , proof , show , spectacle , substantiation , test , testimony , trial , validation , fast , lie-in , love-in , march , mass lobby , parade , peace march , picket , picket line , protest , rally , sit-in * , strike , teach-in , walkout , exhibit , attestation , authentication , corroboration , testament , testimonial , verification , warrant