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



BrE BrE//ˈaɪən//
; NAmE NAmE//ˈaɪən//
; BrE also BrE//ˈaɪɒn//
; NAmE also NAmE//ˈaɪɑːn//
(physics or chemistry) Molecules and matter
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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 Wordfinderantiparticle, atom, electron, ion, neutron, nucleus, particle, positron, proton, valency See related entries: Molecules and matter Word Originmid 19th cent.: from Greek, neuter present participle of ienai ‘go’.
See the Oxford Advanced American Dictionary entry: ion

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