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ion (n.)
Related entries & more 1834, introduced by English physicist and chemist Michael Faraday (suggested by the Rev. William Whewell, English polymath), coined from Greek ion, neuter present participle of ienai "go," from PIE root *ei- "to go." So called because ions move toward the electrode of opposite charge.
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circumnavigation (n.)
Related entries & more "act of sailing round," 1705, from circumnavigate + -ion.
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flocculation (n.)
Related entries & more "the union of small particles into granular aggregates," 1875, from flocculate + -ion.