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.