cavity

noun

cav·​i·​ty ˈka-və-tē 

plural cavities

1

: an unfilled space within a mass

especially : a hollowed-out space

2

: an area of decay in a tooth : caries

Synonyms of cavity

• hole
• dent
• pit
• concavity

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

Engineers must align all parts to millimeter-level tolerances during pre-assembly so the components fit accurately once placed in the reactor cavity. — Aman Tripathi, Interesting Engineering, 30 July 2026

Since the explosion, the site has been a sort of physical and economic cavity for Jay. — Ethan Brooks, The Atlantic, 30 July 2026

Ho also said Celeste bore two significant penetrating injuries — one wound to her abdomen, which passed through the diaphragm and injured the liver, and the other penetrated the left side of her chest, damaging ribs and entered the chest cavity. — Marlene Lenthang, NBC news, 25 July 2026

Another sees Mendieta herself deep in a rocky cavity, as if consumed by the wildflowers sprouting around her. — The Week Uk, TheWeek, 24 July 2026

Word History

Etymology

borrowed from Middle French & Late Latin; Middle French cavité, borrowed from Late Latin cavitāt-, cavitās, from Latin cavus "hollow, concave" + -itāt-, -itās -ity — more at hole entry 1

First Known Use

1541, in the meaning defined at sense 1

Phrases Containing cavity

• abdominal cavity
• body cavity
• pelvic cavity
• segmentation cavity
• spinal cavity
• thoracic cavity

Rhymes for cavity

• gravity
• concavity
• depravity
• intracavity
• microgravity
• supergravity

Kids 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

Medical Definition

cavity

noun

cav·​i·​ty ˈkav-ət-ē 

plural cavities

1

: an unfilled space within a mass

2

: an area of decay in a tooth : caries