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'

Aibo is powered by a lithium ion battery that lasts about 1.5 hours and his maximum walking speed is 20 feet per minute.
Sun, News of the World (1999)
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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