Oxford Dictionary English ion noun noun BrE BrE//ˈaɪən// ; NAmE NAmE//ˈaɪən// ; BrE also BrE//ˈaɪɒn// ; NAmE also NAmE//ˈaɪɑːn// (physics or chemistry) Molecules and matter Add to my wordlistjump to other results an atom or a molecule with a positive or negative electric charge caused by its losing or gaining one or more electrons Wordfinderatomantiparticle, 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 ion in the Oxford Learner's Dictionary of Academic EnglishSee ion in the Oxford Advanced American DictionaryCheck pronunciation: ion oxfordlearnersdictionaries.com
