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
In addition, the three species may huddle together in a tree cavity or nest box to share warmth and survive extremely cold nights.
—
Aj Willingham, AJC.com, 26 Jan. 2026
Three technologies—horizontal drilling, injection of light hydrocarbon liquids to mobilize the oil, and use of progressive cavity pumps (inserted into a well to force the oil upwards)—were pivotal, first introduced in the 1990s and becoming widespread soon after.
—Scott Montgomery, Forbes.com, 25 Jan. 2026
The bubble-like structures and carved cavities in the glowing hydrogen are classic signatures of stellar feedback, the process by which newborn stars reshape the cloud that made them.
—Kenna Hughes-Castleberry, Space.com, 21 Jan. 2026
The insulation may be the wrong size for the wall cavity, or the vapor barrier might be improperly stapled to the studs—or detached.
—Lee Wallender, The Spruce, 16 Jan. 2026
See All Example Sentences for cavity
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Aj Willingham, AJC.com, 26 Jan. 2026
Three technologies—horizontal drilling, injection of light hydrocarbon liquids to mobilize the oil, and use of progressive cavity pumps (inserted into a well to force the oil upwards)—were pivotal, first introduced in the 1990s and becoming widespread soon after.
—Scott Montgomery, Forbes.com, 25 Jan. 2026
The bubble-like structures and carved cavities in the glowing hydrogen are classic signatures of stellar feedback, the process by which newborn stars reshape the cloud that made them.
—Kenna Hughes-Castleberry, Space.com, 21 Jan. 2026
The insulation may be the wrong size for the wall cavity, or the vapor barrier might be improperly stapled to the studs—or detached.
—Lee Wallender, The Spruce, 16 Jan. 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 27 Jan. 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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