Etymology
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ion (n.)

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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Definitions of ion

ion (n.)
a particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons;
From wordnet.princeton.edu