Dictionary![]() ![]() cat•i•onPronunciation: (kat'ī"un, -on), [key] —n. Physical Chem. 1. a positively charged ion that is attracted to the cathode in electrolysis. 2. any positively charged atom or group of atoms (opposed to anion). Also,kation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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