ion

noun

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\ ˈī-ən

, ˈī-ˌän

Definition of ion

(Entry 1 of 3)

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

abbreviation

Definition of Ion (Entry 2 of 3)

Ionic

-ion

noun suffix

Definition of -ion (Entry 3 of 3)

1a : act or process validation

b : result of an act or process regulation

2 : state or condition hydration

Example Sentences Phrases Containing ion Learn More About ion

Examples of ion in a Sentence

Recent Examples on the Web: Noun Negative ion technology accompanied by far infrared heat, seals hair cuticles while protecting strands. — Bianca Salonga, Forbes, 24 Apr. 2022 Crucially, grid-scale batteries don’t have to only rely on lithium-ion technology. — John Ainger, Fortune, 9 Mar. 2022 The LiFePO4 battery technology is a step up from traditional lithium-ion batteries, promising a longer shelf life and better safety. — Mike Richard And Dale Arden Chong, Men's Health, 10 June 2022 But progress has been slow, with the Energy Department estimating in 2019 that lithium-ion batteries are collected and recycled at a rate of less than 5%. — Tristan Bove, Fortune, 10 June 2022 Orca’s modular, open-architecture design would permit multiple payloads depending on mission objectives, and its diesel-electric propulsion system utilizing lithium-ion batteries would enable the robotic subs to remain submerged for up to five days. — Loren Thompson, Forbes, 2 June 2022 This lightweight substance is a critical component in rechargeable lithium-ion batteries, which are used in most personal electronics and electric vehicles. — Emily Barone, Time, 26 May 2022 The plant, which will be the second EV battery plant announced for the automaker in North America, is slated to begin production of lithium-ion batteries in early 2025, according to a news release Tuesday. — Eric D. Lawrence, Detroit Free Press, 24 May 2022 For the past three decades, lithium-ion batteries have been king. — Pranshu Verma, Washington Post, 18 May 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.

Learn More About ion

Dictionary Entries Near ion

-ion

ion

Iona

Statistics for ion

Last Updated

25 Jun 2022

Cite this Entry

“Ion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ion. Accessed 6 Jul. 2022.

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More Definitions for ion

ion

noun

\ ˈī-ən

, ˈī-ˌän \

Kids Definition of ion

: an atom or group of atoms that carries an electric charge

-ion

noun suffix

Kids Definition of -ion

1 : act or process construction

2 : result of an act or process regulation eruption

3 : state or condition perfection

ion

noun

\ ˈī-ən

, ˈī-ˌän

Medical Definition of ion

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)