characterized by or given to open exhibition or expression of one's emotions, attitudes, etc., especially of love or affection: She wished her fiancé were more demonstrative.
serving to demonstrate; explanatory or illustrative.
serving to prove the truth of anything; indubitably conclusive.
Grammar. indicating or singling out the thing referred to. This is a demonstrative pronoun.
Grammar. a demonstrative word, as this or there.

1350–1400; Middle English demonstratif (< Middle French) < Latin dēmonstrātīvus, equivalent to dēmonstrāt(us) (see demonstrate) + -īvus -ive

demonstratively, adverb
demonstrativeness, noun
nondemonstrative, adjective
nondemonstratively, adverb
nondemonstrativeness, noun
predemonstrative, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
demonstrative (dɪˈmɒnstrətɪv)
adj (foll by of)
1.  tending to manifest or express one's feelings easily or unreservedly
2.  serving as proof; indicative
3.  involving or characterized by demonstration: a demonstrative lecture
4.  conclusive; indubitable: demonstrative arguments
5.  grammar interrogative Compare relative denoting or belonging to a class of determiners used to point out the individual referent or referents intended, such as this, that, these, and those
6.  grammar a demonstrative word or construction

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

late 14c., "that shows something," from Fr. démonstratif (14c.), from L. demonstrativus, from pp. stem of demonstrare (see demonstration). Meaning "given to outward expressions of feelings" is from 1819. Demonstrative pronoun is late 16c.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The hall was packed with attentive but demonstrative people who seemed to
  regard her as an old friend.
Even if it has a reference, it is only demonstrative and not substantial.
Drummond is known for demonstrative behavior, but today's civil disobedience
  threw the world championships into momentary chaos.
Some air-kissers out there are wondering if they should be less demonstrative
  with all the warnings from public health officials.
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