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
Kaif Shaikh, Interesting Engineering, 31 Dec. 2025
How Baking Soda In Beans Prevents Gas Not to get too complicated, but sodium bicarbonate, or baking soda, is a mildly alkaline compound that can neutralize acids by releasing bicarbonate ions, raising the pH of its environment.
—Katie Rosenhouse, Southern Living, 30 Dec. 2025
Lithium-ion laptop batteries pose a fire hazard if crushed or damaged, Noble said.
—Nushrat Rahman, Freep.com, 27 Dec. 2025
Energy Dome expects its LDES solution to be 30 percent cheaper than lithium-ion.
—IEEE Spectrum, 21 Dec. 2025
See All Example Sentences for ion
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Noun
Scientists operating the Wendelstein 7-X stellarator in Germany reached a major fusion milestone in 2025 by producing high-energy helium-3 ions for the first time.
—Kaif Shaikh, Interesting Engineering, 31 Dec. 2025
How Baking Soda In Beans Prevents Gas Not to get too complicated, but sodium bicarbonate, or baking soda, is a mildly alkaline compound that can neutralize acids by releasing bicarbonate ions, raising the pH of its environment.
—Katie Rosenhouse, Southern Living, 30 Dec. 2025
Lithium-ion laptop batteries pose a fire hazard if crushed or damaged, Noble said.
—Nushrat Rahman, Freep.com, 27 Dec. 2025
Energy Dome expects its LDES solution to be 30 percent cheaper than lithium-ion.
—IEEE Spectrum, 21 Dec. 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 1 Jan. 2026.
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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