-ion

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

< Latin -iōn- (stem of -iō) suffix forming nouns, especially on past participle stems; replacing Middle English -ioun < Anglo-French < Latin -iōn-

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

-ion

suffix

indicating an action, process, or state: creation, objection Compare -ation, -tion

Word Origin

from Latin -iōn-, -io

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.