demonstrativea.[F. dmonstratif, L. demonstrativus.]1. Having the nature of demonstration; tending to demonstrate; making evident; exhibiting clearly or conclusively.(Dryden.)An argument necessary and demonstrative. (Hooker.)2. Expressing, or apt to express, much; displaying feeling or sentiment; as, her nature was demonstrative.()3. Consisting of eulogy or of invective.(Blair.)Demonstrative pronoun (Gram.), a pronoun distinctly designating that to which it refers.()n. (Gram.) A demonstrative pronoun; as, this and that are demonstratives.()