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.

"pertaining to ions," 1890, from ion + -ic.

subatomic particle suffix, from ion.

"act of sailing round," 1705, from circumnavigate + -ion.

"irregular means, deceitful action," 1590s, from indirect + -ion.

region of the outer atmosphere, 1926, from ion + sphere. Coined by Scottish radar pioneer Robert A. Watson-Watt (1892-1973). So called because it contains many ions.

"the union of small particles into granular aggregates," 1875, from flocculate + -ion.

the end of some nouns of action; see -ate + -ion.

"act of looking forward or into the distance," 1660s; see prospect (n.) + -ion.

1660s, noun of action from Latin levitas "lightness" (see levitate) + -ion.