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

 

irradiance

 noun
noun
BrE BrE//ɪˈreɪdiəns//
 
; NAmE NAmE//ɪˈreɪdiəns//
 
[uncountable](physics)
 
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a measurement of the amount of light that comes from something
See the Oxford Advanced American Dictionary entry: irradiance