Pronunciation: (du-mon'stru-tiv),[key] —adj. 1. characterized by or given to open exhibition or expression of one's emotions, attitudes, etc., esp. of love or affection: She wished her fiancé were more demonstrative. 2. serving to demonstrate; explanatory or illustrative.
3. serving to prove the truth of anything; indubitably conclusive.
4. Gram.indicating or singling out the thing referred to. This is a demonstrative pronoun.