— demonstrational , adj. — demonstrationist , n.
/dem'euhn stray"sheuhn/ , n.
1. the act or circumstance of proving or being proved conclusively, as by reasoning or a show of evidence: a belief incapable of demonstration.
2. something serving as proof or supporting evidence: They sent a check as a demonstration of their concern.
3. a description or explanation, as of a process, illustrated by examples, specimens, or the like: a demonstration of methods of refining ore.
4. the act of exhibiting the operation or use of a device, machine, process, product, or the like, as to a prospective buyer.
5. an exhibition, as of feeling; display; manifestation: His demonstration of affection was embarrassing.
6. a public exhibition of the attitude of a group of persons toward a controversial issue, or other matter, made by picketing, parading, etc.
7. a show of military force or of offensive operations made to deceive an enemy.
8. Math. a logical presentation of the way in which given assumptions imply a certain result; proof.
[ 1325-75; ME demonstracioun demonstration- (s. of demonstratio, equiv. to demonstrat ( us ) (see DEMONSTRATE) + -ion- -ION ]