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

Example Sentences

Recent Examples on the Web
Noun
China refines 95% of the world’s supply of cobalt, a metal used in lithium-ion batteries. Carol Ryan, WSJ, 16 Jan. 2023 Other electricity providers have responded to a state mandate for longer-duration storage by investing in lithium-ion batteries capable of discharging for eight hours. Sammy Rothstaff Writer, Los Angeles Times, 12 Jan. 2023 South 8’s proprietary technology uses Liquefied Gas Electrolyte, or LiGas, in lithium-ion batteries instead of a liquid electrolyte that is commonly used. San Diego Union-Tribune, 11 Jan. 2023 Power companies are building lithium-ion batteries as fast as possible to store solar power for after dark. Sammy Rothstaff Writer, Los Angeles Times, 29 Dec. 2022 Lithium-ion batteries are expensive and supplies are limited. WSJ, 29 Dec. 2022 Lithium-ion batteries are widely used in a variety of electronic devices, including laptops, smartphones, and electric vehicles, due to their high energy density, low self-discharge rate, and relatively long lifespan. Kyle Edward, Forbes, 28 Dec. 2022 And now a race is on to collect and recycle used lithium-ion batteries. Kellen Browning, New York Times, 21 Dec. 2022 And now a race is on to collect and recycle used lithium-ion batteries. Niraj Chokshi, BostonGlobe.com, 21 Dec. 2022 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ion.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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

Time Traveler
The first known use of ion was circa 1834

Dictionary Entries Near ion

Cite this Entry

“Ion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ion. Accessed 28 Jan. 2023.

Kids Definition

ion

1 of 2 noun
ˈī-ən How to pronounce ion (audio)
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

Medical Definition

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)

More from Merriam-Webster on ion

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