de·mon·stra·tive

[duh-mon-struh-tiv]
adjective
1.
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.
2.
serving to demonstrate; explanatory or illustrative.
3.
serving to prove the truth of anything; indubitably conclusive.
4.
Grammar. indicating or singling out the thing referred to. This is a demonstrative pronoun.
noun
5.
Grammar. a demonstrative word, as this or there.
00:10
Demonstrative is always a great word to know.
So is lozenge. Does it mean:
a dash one em long.
diamond

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

de·mon·stra·tive·ly, adverb
de·mon·stra·tive·ness, noun
non·de·mon·stra·tive, adjective
non·de·mon·stra·tive·ly, adverb
non·de·mon·stra·tive·ness, noun
pre·de·mon·stra·tive, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
demonstrative (dɪˈmɒnstrətɪv) [Click for IPA pronunciation guide]
 
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
 
n
6.  grammar a demonstrative word or construction
 
de'monstratively
 
adv
 
de'monstrativeness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

demonstrative
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
Then he walked up the gulch, past the cabin, still whistling with demonstrative
  unconcern.
Demonstrative exhibits need to fairly and accurately represent the evidence.
Demonstrative evidence, on the other hand, has a lower standard for
  admissibility.
Prepares charts, graphs and other demonstrative exhibits to illustrate findings.
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