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, 17 Sep. 2025
If scientists have been underestimating the energy stored in flare ions, forecasts of space weather may need to be revised.
—Sharmila Kuthunur, Space.com, 11 Sep. 2025
The main risk is that these batteries can overheat and go into thermal runaway, a chain reaction that occurs when a lithium-ion cell enters an uncontrollable, self-heating state—resulting in extremely high temperature, smoke and, ultimately, a fire that is notoriously difficult to put out.
—Suzanne Rowan Kelleher, Forbes.com, 10 Sep. 2025
That's due to polarization, which hampers the movement of lithium ions into the battery's electrodes during rapid charging and discharging.
—Abhimanyu Ghoshal, New Atlas, 6 Sep. 2025
See All Example Sentences for ion
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Noun
The material also strongly repelled chloride ions, cutting corrosion risks.
—Neetika Walter, Interesting Engineering, 17 Sep. 2025
If scientists have been underestimating the energy stored in flare ions, forecasts of space weather may need to be revised.
—Sharmila Kuthunur, Space.com, 11 Sep. 2025
The main risk is that these batteries can overheat and go into thermal runaway, a chain reaction that occurs when a lithium-ion cell enters an uncontrollable, self-heating state—resulting in extremely high temperature, smoke and, ultimately, a fire that is notoriously difficult to put out.
—Suzanne Rowan Kelleher, Forbes.com, 10 Sep. 2025
That's due to polarization, which hampers the movement of lithium ions into the battery's electrodes during rapid charging and discharging.
—Abhimanyu Ghoshal, New Atlas, 6 Sep. 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 18 Sep. 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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