Definitions

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

  • noun The unit of luminance in the centimeter-gram-second system, equivalent to the luminance of a perfectly diffusing surface that emits or reflects one lumen per square centimeter.

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

  • noun physics a cgs unit of illumination; the brightness of a surface that emits one lumen per square centimetre

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[After Johann Heinrich Lambert, (1728–1777), German physicist and astronomer.]

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