[dem-uh
n-strey-shuhn] 
| 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. | Mathematics. a logical presentation of the way in which given assumptions imply a certain result; proof. |