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illuminance

 - 7 dictionary results
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il⋅lu⋅mi⋅nance

  [i-loo-muh-nuhns]
Use illuminance in a Sentence
–noun Optics.
illumination (def. 6).
Origin:
1940–45; illumin(ate) + -ance
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il⋅lu⋅mi⋅na⋅tion

  [i-loo-muh-ney-shuhn]
–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:
1300–50; ME < ML illūminātiōn- (s. of illūminātiō) spiritual enlightenment (L: illustriousness, glory) See illuminate, -ion

Related forms:
il⋅lu⋅mi⋅na⋅tion⋅al, adjective

Synonyms:
5. knowledge, revelation, insight, wisdom.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To illuminance
il·lu·mi·nance   (ĭ-lōō'mə-nəns)   
n.  See illumination.
il·lu·mi·na·tion   (ĭ-lōō'mə-nā'shən)   
n.  

    1. The act of illuminating.

    2. The state of being illuminated.

    3. The art or act of decorating a text, page, or initial letter with ornamental designs, miniatures, or lettering.

    4. An example of this art.

  2. A source of light.

  3. Decorative lighting.

  4. Spiritual or intellectual enlightenment.

  5. Clarification; elucidation.

    1. The art or act of decorating a text, page, or initial letter with ornamental designs, miniatures, or lettering.

    2. An example of this art.

  7. Physics The luminous flux per unit area at any point on a surface exposed to incident light. Also called illuminance.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

illumination 
1340, "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 1563. Illuminate (M.E. enlumyen) originally meant "decorate written material with gold, silver, bright colors;" sense of "shining light on" first recorded 1563. (Illumine in this sense is from 1375.)
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: il·lu·mi·nance
Pronunciation: il-'ü-m&-n&n(t)s
Function: noun
: ILLUMINATION 2

Main Entry: il·lu·mi·na·tion
Pronunciation: il-"ü-m&-'nA-sh&n
Function: noun
1 : the action of supplying orbrightening with light or the resulting state
2 : the luminous flux per unit area on an intercepting surface at any given point called also illuminance —il·lu·mi·nate /il-'ü-m&-"nAt/ transitive verb -nat·ed; -nat·ing
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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