ion

1 of 3

noun

ˈī-ən  ˈī-ˌän 

1

: an atom or group of atoms that carries a positive or negative electric charge as a result of having lost or gained one or more electrons

2

: a charged subatomic particle (such as a free electron)

Ion

2 of 3

abbreviation

Ionic

-ion

3 of 3

noun suffix

1

a

: act or process

validation

b

: result of an act or process

regulation

2

: state or condition

hydration

Examples of ion in a Sentence

Recent Examples on the Web

Noun

This doesn't see three Li-ion battery packs all connected at once for long-range riding, but rather provides a downtube pack plus two spares in a cage hanging from the rear rack. —Paul Ridden june 23, New Atlas, 23 June 2026

The results are being seen as an important sign that sodium-ion batteries can move beyond passenger cars and smaller vehicles into demanding commercial trucking applications. —Atharva Gosavi, Interesting Engineering, 22 June 2026

The new plant will produce 50 million gallons of drinking water every day using cutting-edge nanofiltration and ion-exchange technologies to deliver clear, high-quality water. —Susannah Bryan, Sun Sentinel, 21 June 2026

This hairdryer uses negative ions to reduce frizz, minimize static, and soften your tresses. —Izzy Baskette, PEOPLE, 28 May 2026

Word History

Etymology

Noun

Greek, neuter of iōn, present participle of ienai to go — more at issue entry 1

Noun suffix

French -ion, from Latin -ion-, -io

First Known Use

Noun

circa 1834, in the meaning defined at sense 1

Phrases Containing ion

• hydrogen ion
• ion channel
• ion engine
• ion exchange
• ion exchange resin
• lithium-ion battery

Rhymes for ion

• amphitryon
• dandelion
• herodian
• hawaiian
• ixion
• mauryan
• orion
• procyon
• visayan
• heian
• lion
• mayan

Kids Definition

ion

1 of 2 noun

ˈī-ən 

ˈī-ˌän

: an atom or group of atoms that carries a positive or negative electric charge as a result of having lost or gained one or more electrons

-ion

2 of 2 noun suffix

1

a

: act or process

validation

b

: result of an act or process

regulation

2

: state or condition

hydration

Etymology

Noun suffix

derived from Latin -ion (suffix) "act or process"

Medical Definition

ion

noun

ˈī-ən  ˈī-ˌän 

1

: an atom or group of atoms that carries a positive or negative electric charge as a result of having lost or gained one or more electrons see anion, cation

2

: a charged subatomic particle (as a free electron)