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)
Ionic
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
Elissa Robinson, Detroit Free Press, 23 Jan. 2026
Hard carbon from lignin has undergone testing and showed strong suitability for storing sodium ions as well as great cycle stability.
—Maryna Holovnova, New Atlas, 22 Jan. 2026
This means that water and ions can move across it relatively freely, which is manageable in freshwater environments.
—Scott Travers, Forbes.com, 22 Jan. 2026
In 2014, the team developed a ceramic solid electrolyte capable of conducting lithium ions while physically blocking electrodes, an approach that later attracted backing from Volkswagen and Bill Gates.
—Georgina Jedikovska, Interesting Engineering, 20 Jan. 2026
See All Example Sentences for ion
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Noun
Cellphones and tablets Leaving your cellphone or tablet in the car during freezing temperatures can cause several issues including damage to the lithium ion batteries inside, which are highly sensitive to extreme cold, USA TODAY reports.
—Elissa Robinson, Detroit Free Press, 23 Jan. 2026
Hard carbon from lignin has undergone testing and showed strong suitability for storing sodium ions as well as great cycle stability.
—Maryna Holovnova, New Atlas, 22 Jan. 2026
This means that water and ions can move across it relatively freely, which is manageable in freshwater environments.
—Scott Travers, Forbes.com, 22 Jan. 2026
In 2014, the team developed a ceramic solid electrolyte capable of conducting lithium ions while physically blocking electrodes, an approach that later attracted backing from Volkswagen and Bill Gates.
—Georgina Jedikovska, Interesting Engineering, 20 Jan. 2026
See All Example Sentences for ion
Cite this Entry
“Ion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ion. Accessed 30 Jan. 2026.
Copy CitationKids 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 suffix1
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"
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