Also found in: Thesaurus, Medical, Financial, Acronyms, Encyclopedia, Wikipedia.


1. The condition or quality of being luminous.
2. Physics The intensity of light per unit area of its source. Also called photometric brightness.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. a state or quality of radiating or reflecting light
2. (General Physics) a measure (in candelas per square metre) of the brightness of a point on a surface that is radiating or reflecting light. It is the luminous intensity in a given direction of a small element of surface area divided by the orthogonal projection of this area onto a plane at right angles to the direction. Symbol: L
[C19: from Latin lūmen light]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈlu mə nəns)

1. the state or quality of being luminous.
2. the quality or condition of radiating or reflecting light: the blinding luminance of the sun.
3. the quantitative measure of brightness of a light source or an illuminated surface, equal to luminous flux per unit solid angle emitted per unit projected area of the source or surface.
[1875–80; < Latin lūmin- (see lumen) + -ance]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.luminance - the quality of being luminousluminance - the quality of being luminous; emitting or reflecting light; "its luminosity is measured relative to that of our sun"
physical property - any property used to characterize matter and energy and their interactions
illuminance, illumination - the luminous flux incident on a unit area
incandescence - light from heat
glow, luminescence - light from nonthermal sources
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
The proposed TVPIQA measure focuses on two human visual sensitivity factors, image structures and luminance changes.
Does normal aging specifically affect different brain areas involved in luminance information processing?
Nice, France, May 24, 2013 --( QUBYX has announced that its DICOM calibration solution PerfectLum now supports Konica Minolta CS200, a professional and highly accurate luminance and color meter.
Regrettably, PPV and PF-based light emitting diodes performance are limited by their poor stability as well as low luminance efficiency.
The maximum luminance of devices is 1476, 1806, and 1566 cd/[m.sup.2], respectively.
Achieved both the world's highest level color rendering (CRI >90) and luminance -
In this report, we review previous research on interior lighting and present new data from a field study designed to better understand how the luminance and color of interior lighting affect some basic aspects of driver vision.
Solid-state lighting technology based on lightemitting diodes (LEDs) allows for the development of intelligent street lighting systems with the dynamic changing of the photometric characteristics of luminaires and the luminance of the road surface, depending on traffic and weather conditions [1].
It offers a high-bright LCD panel with a 1,600 by 1,200 resolution, a DICOM calibrated luminance of 400 cd per sq m, a high contrast ratio (1050 to one) and a 176 degrees viewing angle.
While the product gained wide acclaim for its effectiveness in anti-counterfeiting, there were felt to be shortcomings when used as an overlaminate for passports and ID documents, because when transferred onto the paper sheets in booklets, such as passports, the roughness of the paper surface tended to reduce the hologram's luminance, making it difficult to view clearly.
The FDA noted that the luminance displayed by a mobile device can vary greatly, even among identical models.