English Dictionary

Pioneers in dictionary publishing since 1819

ion (ˈaɪən Pronunciation for ion ; -ɒn) 



  1. an electrically charged atom or group of atoms formed by the loss or gain of one or more electrons See also cation, anion

Word Origin

C19: from Greek, literally: going, from ienai to go



suffix forming nouns

  1. indicating an action, process, or state   ⇒ creation, objection
    Compare -ation, -tion

Word Origin

from Latin -iōn-, -io

Translations for 'ion'

  • British English: ion Ions are electrically charged atoms. NOUN
  • Brazilian Portuguese: íon
  • Chinese: 离子离離子
  • European Spanish: ion
  • French: ion
  • German: Ion
  • Italian: ione
  • Japanese: イオン
  • Korean: 이온
  • Portuguese: ião
  • Spanish: ion

Example Sentences Including 'ion'

India currently extracts uranium by the conventional method of concentration and ion exchange.
New Scientist (1998)
It carried 2 parts per hundred thousand (0.002 per cent) of chloraurate ion.
Asimov, Isaac The Complete Stories Volume 2
Relatively high concentrations of unreduced chloraurate ion penetrate the contents of the developing egg.
Asimov, Isaac The Complete Stories Volume 2
Shortly after noon, engineers sent a final command turning off the ion engine, which has used up 90 % of its xenon fuel.
Glasgow Herald (2001)
Such a particle is called a positive ion (the term comes from a Greek word meaning `wanderer").
Youngson, Dr. Robert The Antioxidant Health Plan
The ovaries act as a trap for the ion , which is there reduced to metallic gold and deposited as a shell about the developing egg.
Asimov, Isaac The Complete Stories Volume 2
The result would be an $11 mill ion cost to the Australian taxpayer and a saving of about $4 mill ion for the French.
Misc (1995)
The union obtained $11.5 mill ion for its building, while the ALP sold its headquarters for a believed to be around $3 mill ion.
Misc (1995)


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