English

Definition of lumen noun from the Oxford Advanced Learner's Dictionary

 

lumen

 noun
noun
BrE BrE//ˈluːmen//
 
; NAmE NAmE//ˈluːmen//
 
(abbreviation lm) (physics)
 
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a unit for measuring the rate of flow of light Word Origin late 19th cent.: from Latin, literally ‘light’.
See the Oxford Advanced American Dictionary entry: lumen