/ dɪˈmɒnstrətɪv; NAmE -ˈmɑːn-/ adjective , noun
■ adjective
1.
showing feelings openly, especially feelings of affection :
Some people are more demonstrative than others.
a demonstrative greeting
2.
( grammar ) used to identify the person or thing that is being referred to :
'This' and 'that' are demonstrative pronouns.
■ noun
( grammar ) a demonstrative pronoun or determiner
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WORD ORIGIN
late Middle English (in the senses serving as conclusive evidence of and making manifest ): from Old French demonstratif , -ive , from Latin demonstrativus , from demonstrare point out.