lambert

UK: /ˈlæmbət/ US: (lam′bərt)

WordReference Random House Unabridged Dictionary of American English © 2026

lam•bert  (lam′bərt), n. [Optics.]

1. Optics 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. Abbr.: L

• named after J. H. Lambert 1910–15

Lam•bert  (lam′bərt; for 2 also Ger. läm′bert), n. 

Con•stant  (kon′stənt), 1905–51, English composer and conductor. Jo•hann Hein•rich  (yō′hän hīn′rikh), 1728–77, German scientist and mathematician.
1. a male given name: from Germanic words meaning "land'' and "bright.''

Collins Concise English Dictionary © HarperCollins Publishers::

lambert / ˈlæmbət/ noun

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

Etymology: named after J. H. Lambert (1728–77), German mathematician and physicist

Collins Concise English Dictionary © HarperCollins Publishers::

Lambert / 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