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
Chris Young, Interesting Engineering, 7 Oct. 2025
The handheld vacuum has a lithium ion battery that can run up to 20 minutes on a full charge.
—Stephanie Osmanski, Better Homes & Gardens, 6 Oct. 2025
Bartlett captured the comet's twisting ion tail wax and wane as it was buffeted by the solar wind emanating from our parent star.
—Anthony Wood, Space.com, 3 Oct. 2025
Meanwhile, the electric field also propels a flow of ions across the nanopore.
—IEEE Spectrum, 2 Oct. 2025
See All Example Sentences for ion
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Noun
Dottin and his team used secondary ion mass spectrometry to analyze the sample.
—Chris Young, Interesting Engineering, 7 Oct. 2025
The handheld vacuum has a lithium ion battery that can run up to 20 minutes on a full charge.
—Stephanie Osmanski, Better Homes & Gardens, 6 Oct. 2025
Bartlett captured the comet's twisting ion tail wax and wane as it was buffeted by the solar wind emanating from our parent star.
—Anthony Wood, Space.com, 3 Oct. 2025
Meanwhile, the electric field also propels a flow of ions across the nanopore.
—IEEE Spectrum, 2 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 9 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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