from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The condition or quality of being luminous.
  • noun Physics The intensity of light per unit area of its source.

from The Century Dictionary.

  • noun Luminousness: as, the luminance of the stars.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun the quality of being luminous
  • noun the luminous flux emitted in a given direction divided by the product of the projected area of the source element perpendicular to the direction and the solid angle containing that direction, i.e. luminous intensity divided by unit area; measured in stilbs or apostilbs

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the quality of being luminous; emitting or reflecting light


Sorry, no etymologies found.


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