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
ArsTechnica, 26 June 2025
Before the analysis took place, small samples of material were separated using a high-energy ion beam.
—Rosie McCall, Discover Magazine, 16 June 2025
To avoid the subject material being exposed to Earth's atmosphere and reacting with its oxygen, the ion beam cored into the samples, extracting the beads from within them, and then taking care that the material was protected from our atmosphere.
—Keith Cooper, Space.com, 17 June 2025
This process lowers the pH of seawater and reduces the amount of carbonate ions, which are essential building blocks for many marine creatures.
—Thomas Westerholm, MSNBC Newsweek, 16 June 2025
See All Example Sentences for ion
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Noun
Each of these had a variable number of lithium atoms at each of the corners of these structures, and molecular simulations showed that lithium ions could readily move between these locations, allowing the material to shuffle ions around rapidly.
—ArsTechnica, 26 June 2025
Before the analysis took place, small samples of material were separated using a high-energy ion beam.
—Rosie McCall, Discover Magazine, 16 June 2025
To avoid the subject material being exposed to Earth's atmosphere and reacting with its oxygen, the ion beam cored into the samples, extracting the beads from within them, and then taking care that the material was protected from our atmosphere.
—Keith Cooper, Space.com, 17 June 2025
This process lowers the pH of seawater and reduces the amount of carbonate ions, which are essential building blocks for many marine creatures.
—Thomas Westerholm, MSNBC Newsweek, 16 June 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 14 Jul. 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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