Dictionary.com
Thesaurus.com

lambert

1 American  
[lam-bert] / ˈlæm bərt /

noun

Optics.
  1. the centimeter-gram-second unit of luminance or brightness, equivalent to 0.32 candles per square centimeter, and equal to the brightness of a perfectly diffusing surface emitting or reflecting one lumen per square centimeter. L


Lambert 2 American  
[lam-bert, lahm-bert] / ˈlæm bərt, ˈlɑm bɛrt /

noun

  1. Constant 1905–51, English composer and conductor.

  2. Johann Heinrich 1728–77, German scientist and mathematician.

  3. a male given name: from Germanic words meaning “land” and “bright.”


lambert 1 British  
/ ˈlæmbət /

noun

  1.  L.  the cgs unit of illumination, equal to 1 lumen per square centimetre

"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

Lambert 2 British  
/ ˈlæmbət /

noun

  1. Constant. 1905–51, English composer and conductor. His works include much ballet music and The Rio Grande (1929), a work for chorus, orchestra, and piano, using jazz idioms

"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

lambert Scientific  
/ lămbərt /
  1. A 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. The lambert is named after the Swiss mathematician and physicist Johann Heinrich Lambert (1728–1777).


Etymology

Origin of lambert

First recorded in 1910–15; named after J. H. Lambert