plural cavities
1
: an unfilled space within a mass
especially
: a hollowed-out space
2
: an area of decay in a tooth : caries
Examples of cavity in a Sentence
Some birds nest in tree cavities.
I had two cavities filled at the dentist's.
Recent Examples on the Web
One of the gates of these islands connects to the superconducting cavity built using Josephson junctions that allow quantum currents to flow and complete a microwave circuit.
—
Ameya Paleja, Interesting Engineering, 3 Apr. 2026
For example, a small cavity that needs a quick filling might cost $200.
—Tribune News Service, The Orlando Sentinel, 3 Apr. 2026
Medical organizations like the American Dental Association criticized the move in certain states to ban the mineral, which helps prevent cavities and strengthens teeth.
—Sara Moniuszko, USA Today, 2 Apr. 2026
Once the hectocotylus got inside this cavity, both octopuses ceased all movement for about an hour.
—Jacek Krywko, ArsTechnica, 2 Apr. 2026
See All Example Sentences for cavity
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Ameya Paleja, Interesting Engineering, 3 Apr. 2026
For example, a small cavity that needs a quick filling might cost $200.
—Tribune News Service, The Orlando Sentinel, 3 Apr. 2026
Medical organizations like the American Dental Association criticized the move in certain states to ban the mineral, which helps prevent cavities and strengthens teeth.
—Sara Moniuszko, USA Today, 2 Apr. 2026
Once the hectocotylus got inside this cavity, both octopuses ceased all movement for about an hour.
—Jacek Krywko, ArsTechnica, 2 Apr. 2026
See All Example Sentences for cavity
Cite this Entry
“Cavity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cavity. Accessed 8 Apr. 2026.
Copy CitationKids Definition
cavity
noun
cav·i·ty
ˈkav-ət-ē 
plural cavities
1
: a hollow place
especially
: an unfilled bodily space
lung cavity
2
: a hole hollowed out in a tooth by decay
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