[ih-luhs-truh-tiv, il-uh-strey-tiv]
serving to illustrate; explanatory: illustrative examples.

1635–45; illustrate + -ive

illustratively, adverb
nonillustrative, adjective
nonillustratively, adverb
overillustrative, adjective
overillustratively, adverb
self-illustrative, adjective
unillustrative, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
illustrate (ˈɪləˌstreɪt)
1.  to clarify or explain by use of examples, analogy, etc
2.  (tr) to be an example or demonstration of
3.  (tr) to explain or decorate (a book, text, etc) with pictures
4.  (tr) an archaic word for enlighten
[C16: from Latin illustrāre to make light, explain, from lustrāre to purify, brighten; see lustrum]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Many of the posts in this thread are illustrative of my point.
It is illustrative of his emotional approach to the subject and to the context
  in which he operates.
Maybe you and others are making the comparison for illustrative purposes only
  and not making a tax recommendation.
These entries are for illustrative purposes only and should not be considered
  all inclusive.
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