Definition of ion noun from the Oxford Advanced American Dictionary

 

ion

 noun
noun
NAmE//ˈaɪən//
 
, NAmE//ˈaɪɑn//
 
(physics or chemistry)
 
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an atom or a molecule with a positive or negative electric charge caused by its losing or gaining one or more electrons
See the Oxford Advanced Learner's Dictionary entry: ion

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