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illumination

[ih-loo-muh-ney-shuh n] /ɪˌlu məˈneɪ ʃən/
noun
1.
an act or instance of illuminating.
2.
the fact or condition of being illuminated.
3.
a decoration of lights, usually colored lights.
4.
Sometimes, illuminations. an entertainment, display, or celebration using lights as a major feature or decoration.
5.
intellectual or spiritual enlightenment.
6.
Also called illuminance, intensity of illumination. Optics. the intensity of light falling at a given place on a lighted surface; the luminous flux incident per unit area, expressed in lumens per unit of area.
7.
a supply of light:
a source of illumination.
8.
decoration of a manuscript or book with a painted design in color, gold, etc.
9.
a design used in such decoration.
Origin
1300-1350
1300-50; Middle English < Medieval Latin illūminātiōn- (stem of illūminātiō) spiritual enlightenment (Latin: illustriousness, glory) See illuminate, -ion
Related forms
illuminational, adjective
nonillumination, noun
preillumination, noun
reillumination, noun
Synonyms
5. knowledge, revelation, insight, wisdom.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for intensity of illumination

illumination

/ɪˌluːmɪˈneɪʃən/
noun
1.
the act of illuminating or the state of being illuminated
2.
a source of light
3.
(often pl) (mainly Brit) a light or lights, esp coloured lights, used as decoration in streets, parks, etc
4.
spiritual or intellectual enlightenment; insight or understanding
5.
the act of making understood; clarification
6.
decoration in colours, gold, or silver used on some manuscripts or printed works
7.
(physics) another name (not in technical usage) for illuminance
Derived Forms
illuminational, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for intensity of illumination
illumination
mid-14c., "spiritual enlightenment," from O.Fr. illumination, from L. illuminationem (nom. illuminatio), from illuminare "to throw into light," from in- "in" (with assimilation of -n- to the following consonant) + lumen (gen. luminis) "light." Meaning "the action of lighting" is from 1560s. Illuminate (M.E. enlumyen) originally meant "decorate written material with gold, silver, bright colors;" sense of "shining light on" first recorded 1560s. (Illumine in this sense is from late 14c.)
Online Etymology Dictionary, © 2010 Douglas Harper
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12
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