Etymology
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cation (n.)

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

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Definitions of cation

cation (n.)
a positively charged ion;
From wordnet.princeton.edu