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
Bojan Stojkovski, Interesting Engineering, 26 Oct. 2025
And there are other ideas to do with ion drives and collecting interstellar gas and using that to propel yourself along—but all that would involve very lengthy trips.
—Jeffrey Kluger, Time, 22 Oct. 2025
Then, because of huge investments in lithium-ion technology, batteries became tough competition, explains Yury Gogotsi, who studies materials for energy-storage devices at Drexel University, in Philadelphia.
—Perri Thaler, IEEE Spectrum, 22 Oct. 2025
Along with Grant, Geraint Jones — of the European Space Agency and principal investigator of the Comet Interceptor mission — was able to predict the ion tail crossing thanks to their Tailcatcher program, which is computer code that can track the movements of packets of solar wind material.
—Keith Cooper, Space.com, 21 Oct. 2025
See All Example Sentences for ion
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Noun
By acting like a superhighway for ion signals, graphene ensures that these signals reach the electronic system efficiently, allowing lithium levels to be measured quickly and reliably, and marking a significant step forward in sensor performance.
—Bojan Stojkovski, Interesting Engineering, 26 Oct. 2025
And there are other ideas to do with ion drives and collecting interstellar gas and using that to propel yourself along—but all that would involve very lengthy trips.
—Jeffrey Kluger, Time, 22 Oct. 2025
Then, because of huge investments in lithium-ion technology, batteries became tough competition, explains Yury Gogotsi, who studies materials for energy-storage devices at Drexel University, in Philadelphia.
—Perri Thaler, IEEE Spectrum, 22 Oct. 2025
Along with Grant, Geraint Jones — of the European Space Agency and principal investigator of the Comet Interceptor mission — was able to predict the ion tail crossing thanks to their Tailcatcher program, which is computer code that can track the movements of packets of solar wind material.
—Keith Cooper, Space.com, 21 Oct. 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 31 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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