/ Dictionary / Index K kation: Meaning and Definition of Find definitions for: kat•i•on Pronunciation: (kat'ī"un, -on), [key] — n. Physical Chem. cation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Katie Katmai Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language