illustration

[il-uh-strey-shuhn]
noun
1.
something that illustrates, as a picture in a book or magazine.
2.
a comparison or an example intended for explanation or corroboration.
3.
the act or process of illuminating.
4.
the act of clarifying or explaining; elucidation.
5.
Archaic. illustriousness; distinction.

Origin:
1325–75; Middle English < Latin illustrātiōn- (stem of illustrātiō) the act of making vivid, illustrating. See illustrate, -ion

nonillustration, noun
overillustration, noun
preillustration, noun
reillustration, noun
superillustration, noun


2. explication. See case1.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
illustration (ˌɪləˈstreɪʃən)
 
n
1.  pictorial matter used to explain or decorate a text
2.  an example or demonstration: an illustration of his ability
3.  the act of illustrating or the state of being illustrated
 
illus'trational
 
adj

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

illustration
late 14c., "a spiritual illumination," from O.Fr. illustration, from L. illustrationem (nom. illustratio) "vivid representation" (in writing), lit. "an enlightening," from illustrare "light up, embellish, distinguish," from in- "in" + lustrare "make bright, illuminate." Mental sense of "act of making
clear in the mind" is from 1580s. Meaning "an illustrative picture" is from 1816. Illustrate "educate by means of examples," first recorded 1610s. Sense of "provide pictures to explain or decorate" is 1630s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In illustration b, the image is even more compelling.
Watch a video illustration of what scientists can learn from footprints.
The ability to also scan an illustration makes this information-gathering and
  decision-making process much more efficient.
The fact that these two asked what their final grade was is an illustration of
  this.
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