[dem-uh
n-strey-ter] 
| 1. | a person or thing that demonstrates. |
| 2. | Also, demonstrant. a person who takes part in a public demonstration, as by marching or picketing. |
| 3. | a person who explains orteaches by practical demonstrations. |
| 4. | a person who exhibits the use and application of (a product, service, etc.) to a prospective customer. |
| 5. | the product, device, machine, etc., actually used in demonstrations to purchasers or prospective customers: They sold the demonstrator at half price. |
| coun·ter·dem·on·stra·tion (koun'tər-děm'ən-strā'shən) n. A demonstration held in opposition to another demonstration. coun'ter·dem'on·stra'tor n. |