De-mŏn'stra-tĭve, a.

a. [Lat. demonstrativus, Fr. démonstratif, Pr. demostratiu, Sp. demostrativo, It. dimostrativo. See DEMONSTRATE.]

1. Having the nature of demonstration; tending to demonstrate; making evident; exhibiting clearly. “An argument necessary and demonstrative.” Hooker. “Demonstrative figures.” Dryden.
2. Expressing, or apt to express, much; frank; open; as, a demonstrative person.
3. Consisting of eulogy or of invective. “Demonstrative eloquence.” Blair.

Demonstrative pronoun (Gram.), one distinctly designating that to which it refers.