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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Noun
And thanks to the negative ion technology, this tool helps reduce frizz and add shine to your hair. Kayleigh Drake, Miami Herald, 3 Mar. 2025 What this means for you The authors contend that tea brewing may adsorb heavy metals via heavy metal ions sticking to the surfaces of tea leaves and staying trapped until the bag is disposed. Kristen Rogers, CNN, 26 Feb. 2025 One process called excitotoxicity occurs when too many calcium ions are allowed into neurons, activating enzymes that fragment DNA and damage cells, causing death. Aaron Priester, The Conversation, 19 Feb. 2025 The acid solution is passed through an ion exchanger, which is a column lined with a resin to which the element of interest (rubidium, in this case) will stick. IEEE Spectrum, 11 Feb. 2025 See All Example Sentences for ion

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

Browse Nearby Words

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Cite this Entry

“Ion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ion. Accessed 9 Mar. 2025.

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
Etymology

Noun suffix

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

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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