demonstrative

Concise Oxford English Dictionary © 2008 Oxford University Press:
demonstrative /dɪˈmɒnstrətɪv/

▶adjective

• 1 tending to show affectionate or other feelings openly.

• 2 serving to demonstrate something.

• 3 Grammar (of a determiner or pronoun) indicating the person or thing referred to (e.g. this, that, those).

▶noun Grammar a demonstrative determiner or pronoun.

– derivatives
demonstratively adverb,
demonstrativeness noun.