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
Neetika Walter, Interesting Engineering, 30 Aug. 2025
The thicker the membrane, the longer this memory lasts; in some cases up to about 140 seconds, far beyond what simple ion movement would predict.
—New Atlas, 30 Aug. 2025
The curler is coated in a layer of tourmaline ceramic that releases negative ions to eliminate frizz and static.
—Olivia Young, Travel + Leisure, 28 Aug. 2025
The new rule comes as the agency continues to crack down on electronics that use lithium ion batteries due to an increase in related fire incidents onboard airplanes.
—Blane Bachelor, AFAR Media, 27 Aug. 2025
See All Example Sentences for ion
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Noun
Electrochemical impedance results showed lower resistance, faster ion flow, and fewer corrosive by-products.
—Neetika Walter, Interesting Engineering, 30 Aug. 2025
The thicker the membrane, the longer this memory lasts; in some cases up to about 140 seconds, far beyond what simple ion movement would predict.
—New Atlas, 30 Aug. 2025
The curler is coated in a layer of tourmaline ceramic that releases negative ions to eliminate frizz and static.
—Olivia Young, Travel + Leisure, 28 Aug. 2025
The new rule comes as the agency continues to crack down on electronics that use lithium ion batteries due to an increase in related fire incidents onboard airplanes.
—Blane Bachelor, AFAR Media, 27 Aug. 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 9 Sep. 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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