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, 20 Oct. 2025
That all structures that are built out of atoms and their constituents — including molecules, ions, and enzymes — can be described based on the fundamental laws of nature and the component structures that they’re made out of.
—Big Think, 16 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
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
See All Example Sentences for ion
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Noun
Unlike lithium-ion technology, which currently dominates the energy storage market and relies on expensive, environmentally damaging materials, sodium is far more abundant and widely available.
—Neetika Walter, Interesting Engineering, 20 Oct. 2025
That all structures that are built out of atoms and their constituents — including molecules, ions, and enzymes — can be described based on the fundamental laws of nature and the component structures that they’re made out of.
—Big Think, 16 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
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
See All Example Sentences for ion
Cite this Entry
“Ion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ion. Accessed 24 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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