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
Keith Cooper, Space.com, 13 Oct. 2025
Once captured by the QuBUS, the photons were coupled into a fiber optic cable and sent to an ion trap at the Max Planck Institute for the Science of Light (MPL) in Erlangen for analysis.
—Aman Tripathi, Interesting Engineering, 10 Oct. 2025
These external influences excite the molecules and atoms in the rings, creating ions.
—Big Think, 9 Oct. 2025
Susumu Kitagawa, Richard Robson, and Omar Yaghi discovered that copper ions could be used to create a crystal with large cavities within it, which was porous to smaller atoms and molecules but blocked larger ones.
—Tom Chivers, semafor.com, 8 Oct. 2025
See All Example Sentences for ion
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Noun
Returning to the team's analysis, an isotope is an atom of a specific element that has the same number of protons but a different number of neutrons — and Dottin wanted to check the isotopic ratios of sulfur, which a secondary ion mass spectrometry can measure precisely.
—Keith Cooper, Space.com, 13 Oct. 2025
Once captured by the QuBUS, the photons were coupled into a fiber optic cable and sent to an ion trap at the Max Planck Institute for the Science of Light (MPL) in Erlangen for analysis.
—Aman Tripathi, Interesting Engineering, 10 Oct. 2025
These external influences excite the molecules and atoms in the rings, creating ions.
—Big Think, 9 Oct. 2025
Susumu Kitagawa, Richard Robson, and Omar Yaghi discovered that copper ions could be used to create a crystal with large cavities within it, which was porous to smaller atoms and molecules but blocked larger ones.
—Tom Chivers, semafor.com, 8 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 19 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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