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



BrE BrE//ˈkætaɪən//
; NAmE NAmE//ˈkætaɪən//
(chemistry, physics) Molecules and matter
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an ion with a positive electrical charge compare anion See related entries: Molecules and matter Word Origin mid 19th cent.: from cata ‘alongside’ or from cathode, + ion.
See the Oxford Advanced American Dictionary entry: cation