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a suffix, appearing in words of Latin origin, denoting action or condition, used in Latin and in English to form nouns from stems of Latin adjectives (communion; union), verbs (legion; opinion), and especially past participles (allusion; creation; fusion; notion; torsion).
Also, -ation, -ition, -tion.
Compare -cion, -xion.
Origin of -ion
< Latin -iōn- (stem of -iō) suffix forming nouns, especially on past participle stems; replacing Middle English -ioun < Anglo-French < Latin -iōn- Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for -ion
  • These same researchers have gotten viruses to do other creative tasks for them, including building a lithium-ion battery.
  • Tesla's vehicles use standard lithium-ion battery cells.
  • When lithium-ion batteries were invented, mobile phones became small enough to be slipped into a pocket.
  • It has developed lithium-ion batteries that are unusually cheap and easy to make.
  • Their expensive lithium-ion battery packs will be leased.
  • Lithium-ion polymer batteries, which can be easily moulded to fit different shapes, have made possible ultra-slim devices.
  • Lithium-ion chemistry is considered an improvement over past efforts to power electric cars.
  • Li-ion batteries will take the hybrid vehicles to a higher level.
  • The key is lowering the cost of the lithium-ion battery.
  • The fire is linked to lithium-ion batteries in a box of smokeless cigarettes.
British Dictionary definitions for -ion


indicating an action, process, or state: creation, objection Compare -ation, -tion
Word Origin
from Latin -iōn-, -io
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for -ion

suffix forming nouns of state, condition, or action from verbs, from Latin -ionem (nominative -io), sometimes via French -ion.

Online Etymology Dictionary, © 2010 Douglas Harper
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