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or kation

[kat-ahy-uh n, -on] /ˈkætˌaɪ ən, -ɒn/
noun, Physical Chemistry.
a positively charged ion that is attracted to the cathode in electrolysis.
any positively charged atom or group of atoms (opposed to anion).
Origin of cation
1825-35; < Greek katión going down (neuter of katiṓn, present participle of kateînai), equivalent to kat- cat- + -i- go + -on neuter present participle suffix
Related forms
[kat-ahy-on-ik] /ˌkæt aɪˈɒn ɪk/ (Show IPA),
cationically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for cation


a positively charged ion; an ion that is attracted to the cathode during electrolysis Compare anion
Derived Forms
cationic (ˌkætaɪˈɒnɪk) adjective
Word Origin
C19: from cata- + ion
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for cation

1834, from Greek kation "going down," neuter present participle of katienai "to go down," from kata "down" (see cata-) + ienai "to go" (see ion). Proposed by the Rev. William Whewell (1794-1866), English polymath, and published by English physicist Michael Faraday.

Online Etymology Dictionary, © 2010 Douglas Harper
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cation in Medicine

cation cat·i·on (kāt'ī'ən)
An ion or group of ions having a positive charge and characteristically moving toward the negative electrode in electrolysis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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cation in Science
An ion with net positive charge, having more protons than electrons. In electrolysis, cations migrate to a negatively charged cathode. Compare anion.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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