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, 25 Jan. 2025
When salty water is absorbed into the soil, sodium ions displace nutrients such as potassium and phosphorus, interfering with beneficial microbes.
—Lauren Landers, Better Homes & Gardens, 24 Jan. 2025
The startup has developed a device that can send acoustic waves across a battery and help the lithium ions charge in a smoother way.
—Katie Fehrenbacher, Axios, 23 Jan. 2025
There are alternatives to chemical rockets, such as ion drives and solar sails, but these produce minuscule thrust and have limited applications.
—David Szondy, New Atlas, 20 Jan. 2025
See all Example Sentences for ion 
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Noun
One problem in particular is that the ion plume can damage a spacecraft.
—Keith Cooper, Space.com, 25 Jan. 2025
When salty water is absorbed into the soil, sodium ions displace nutrients such as potassium and phosphorus, interfering with beneficial microbes.
—Lauren Landers, Better Homes & Gardens, 24 Jan. 2025
The startup has developed a device that can send acoustic waves across a battery and help the lithium ions charge in a smoother way.
—Katie Fehrenbacher, Axios, 23 Jan. 2025
There are alternatives to chemical rockets, such as ion drives and solar sails, but these produce minuscule thrust and have limited applications.
—David Szondy, New Atlas, 20 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 30 Jan. 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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