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
Clara Harter, Los Angeles Times, 29 Jan. 2025
But sulfur has a tendency to react with itself, producing ions that can float off into the electrolyte.
—Ashley Belanger, Ars Technica, 17 Jan. 2025
The short answer is that water molecules absorb much more red light than blue light, owing to the different vibrations of hydrogen and oxygen ions, and thus the water in your pool appears blue.
—John McPhee, The New Yorker, 13 Jan. 2025
One problem in particular is that the ion plume can damage a spacecraft.
—Keith Cooper, Space.com, 25 Jan. 2025
See all Example Sentences for ion 
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Noun
Hydrogen fluoride is a highly toxic gas produced by lithium ion battery fires that can cause severe respiratory damage as well as skin and eye burns.
—Clara Harter, Los Angeles Times, 29 Jan. 2025
But sulfur has a tendency to react with itself, producing ions that can float off into the electrolyte.
—Ashley Belanger, Ars Technica, 17 Jan. 2025
The short answer is that water molecules absorb much more red light than blue light, owing to the different vibrations of hydrogen and oxygen ions, and thus the water in your pool appears blue.
—John McPhee, The New Yorker, 13 Jan. 2025
One problem in particular is that the ion plume can damage a spacecraft.
—Keith Cooper, Space.com, 25 Jan. 2025
See all Example Sentences for ion
Dictionary Entries Near ion
Cite this Entry
“Ion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ion. Accessed 11 Feb. 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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