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
Mrigakshi Dixit, Interesting Engineering, 30 Sep. 2025
The researchers then added chemical sensors that could detect ions, such as sodium, and neurotransmitters like dopamine.
—New Atlas, 30 Sep. 2025
Glutamate triggers a bunch of positive ions to flood into a neuron, increasing its internal voltage and spurring it to fire an action potential, a strong burst of electricity that travels down a nerve fiber and makes the neuron release its own set of molecules to communicate with others, and so on.
—Yasemin Saplakoglu, Quanta Magazine, 29 Sep. 2025
The ion technology helps smooth hair and reduce frizz.
—Bestreviews, Mercury News, 25 Sep. 2025
See All Example Sentences for ion
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Noun
Zinc perchlorate remains primarily in the liquid to control the ion movement and improve the battery’s freeze resistance for cold-weather performance.
—Mrigakshi Dixit, Interesting Engineering, 30 Sep. 2025
The researchers then added chemical sensors that could detect ions, such as sodium, and neurotransmitters like dopamine.
—New Atlas, 30 Sep. 2025
Glutamate triggers a bunch of positive ions to flood into a neuron, increasing its internal voltage and spurring it to fire an action potential, a strong burst of electricity that travels down a nerve fiber and makes the neuron release its own set of molecules to communicate with others, and so on.
—Yasemin Saplakoglu, Quanta Magazine, 29 Sep. 2025
The ion technology helps smooth hair and reduce frizz.
—Bestreviews, Mercury News, 25 Sep. 2025
See All Example Sentences for ion
Cite this Entry
“Ion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ion. Accessed 2 Oct. 2025.
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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