ion English · revision 7435

+ {{infobox|confidence=established|formation=borrowing|attested=1834|origins=grc εἶμι}}

+

+ ==Pronunciation==

+ * IPA: /ˈaɪən/, /ˈaɪ.ɒn/^(Wiktionary)

+

+ ==Etymology==

+ It is from Greek [[m|grc|ἰόν|tr=ión|t=going]], the neuter present participle of [[m|grc|εἶμι|tr=iénai|t=to go]],^(Barnhart 1988)^(Etymonline)^(Hoad 1986)^(MWU 2024) from PIE [[ine-pro|*h₁ey-|alt=*ei-|t=to go]].^(Etymonline) It was introduced in 1834 by Michael Faraday, at the suggestion of William Whewell.^(Etymonline)^(OED 1989)

+

+ ==Earliest recorded meaning==

+ Either of the constituents that pass to the electrodes in electrolysis: 1834.^(OED 1989)^(Barnhart 1988)^(Etymonline)

+

+ ==Semantic evolution==

+ The name was given because ions move toward the electrode of opposite charge.^(Etymonline)^(Barnhart 1988) The modern sense, an atom or group of atoms with a positive or negative electric charge, followed.^(SOED 2002)^(AHD) ''Ion beam'' and ''ion engine'' are from 1932 on.^(OED 1989) [[ionize|alt=Ionize]] is a 19th-century formation.^(Hoad 1986)

+

+ ==Timeline==

+ * 1834 – coined by Faraday.^(OED 1989)^(Etymonline)

+ * 1932 – ion beam.^(OED 1989)

+

+ ==Modern meaning==

+ ===Noun===

+ # An [[atom]] or group of atoms with a net electric charge, from having lost or gained one or more [[electron|alt=electrons]].^(AHD)^(Collins 2023)

+

+ ==Word family==

+ * [[anion]]

+ * [[cation]]

+

+ ==Related words==

+ * [[ionize]]

+ * [[ionosphere]]

+ * [[exit]]

+ * [[issue]]

+

+ ==References==

+ {{reflist}}