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

 

refraction

 noun
noun
BrE BrE//rɪˈfrækʃn//
 
; NAmE NAmE//rɪˈfrækʃn//
 
[uncountable](physics)
 
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the fact of light, radio waves, etc. changing direction when they go through water, air, glass, etc. at an angle The degree to which the light changes direction is called the angle of refraction.