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masc. proper name, from French, from German Lambert, from Old High German Lambreht, from lant "land" + beraht "bright." Old English cognate was Landbeorht. The popularity of the name from 12c. is probably due to immigration from Flanders, where St. Lambert of Maestricht was highly venerated. Attested as a surname from mid-12c.
unit of luminance (brightness) in the centimetre-gram-second system of physical measurement. (See the International System of Units.) It is defined as the brightness of a perfectly diffusing surface that radiates or reflects one lumen per square centimetre. The unit was named for the 18th-century German physicist Johann Heinrich Lambert. It is used by astronomers as well as by physicists, engineers, and photographers.