Main Entry: ion Pronunciation: 'I-&n, 'I-"�n Function: noun Etymology: Greek, neuter of iOn, present participle of ienai to go -- more at ISSUE Date: circa 1834 1 : an atom or group of atoms that carries a positive or negative electric charge as a result of having lost or gained one or more electrons 2 : a charged subatomic particle (as a free electron)
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