English

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

 

axion

 noun
noun
BrE BrE//ˈæksiən//
 
; NAmE NAmE//ˈæksiən//
 
(physics)
 
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according to some theories, a particle smaller than an atom which is very light and has no electrical charge Word Origin 1970s: from axial + -on.
See the Oxford Advanced American Dictionary entry: axion