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

While both generations are still effectively lithium ion batteries, the upgrade is consistent with the boost in capacity seen in these Samsung Galaxy Watch Ultra 2 specs. — Andrew Williams, Forbes.com, 21 July 2026

The Li-ion batteries will replace the lead-acid technology currently used in the vessels. — Georgina Jedikovska, Interesting Engineering, 21 July 2026

Roomba battery facts Roombas use rechargeable batteries, either lithium-ion (Li-ion) or sometimes nickel metal hydride (NiMH) in some older models. — Bestreviews, Mercury News, 20 July 2026

This eCVT uses a planetary gear arrangement that sends power from the engine to one electric motor to charge the RAV4’s lithium-ion traction battery. — Jonathan M. Gitlin, ArsTechnica, 16 July 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)