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  Dictionary Definition of ion

ion
noun
1. an electrically charged atom, group, or molecule, formed by the loss or gain of one or more electrons, or by the dissolving of an electrolyte in a solvent of high dielectric constant. Positive ions, created by electron loss, are called cations and are attracted to the cathode in electrolysis. Negative ions, created by electron gain, are called anions and are attracted to the anode. The valency of an ion is equal to the number of electrons lost or gained and is indicated by a plus sign for cations and minus for anions, thus: Na+, Cl{\super -, Ca+.
2. one of the electrically charged particles formed in a gas by the action of an electric discharge, etc.
[Greek, ppr. neut. of iénai go]
-- ionic , adjective