thickness

noun

thick·​ness ˈthik-nəs 

1

: the smallest of three dimensions

length, width, and thickness

2

: the quality or state of being thick

3

a

: viscous consistency

boiled to the thickness of honey

b

: the condition of being smoky, foul, or foggy

4

: the thick part of something

5

: concentration, density

6

: stupidity, dullness

7

: layer, ply, sheet

a single thickness of canvas

Synonyms of thickness

• consistency
• consistence
• density

Examples of thickness in a Sentence

The plank measures two inches in thickness.

the length, circumference, and thickness of the log

Plywood is available in various thicknesses.

Cooking time will vary depending on the thickness of the steak.

I added flour to increase the gravy's thickness.

I was surprised by the thickness of his accent.

Recent Examples on the Web

Measuring 12 miles in thickness, this layer is unlike anything previously observed beneath an island located in the middle of a tectonic plate. —Mrigakshi Dixit, Interesting Engineering, 16 Dec. 2025

Slice the tenderloin to desired thickness and drizzle sauce over top. —CBS News, 16 Dec. 2025

The structure's thickness has never been seen anywhere else in the world for islands in the middle of a tectonic plate, the researchers said. —Julia Jacobo, ABC News, 15 Dec. 2025

Use the bottom of a heavy glass or measuring cup to smash cauliflower, without breaking florets, to about 1/2-inch thickness. —Maddy Bendgen, Better Homes & Gardens, 3 Dec. 2025

Word History

First Known Use

before the 12th century, in the meaning defined at sense 1

Rhymes for thickness

• quickness
• sickness
• homesickness
• seasickness

Kids Definition

thickness

noun

thick·​ness ˈthik-nəs 

1

: the quality or state of being thick

2

: the smallest of three dimensions

length, width, and thickness

3

: the thick part of something

4

: layer entry 1 sense 2

a single thickness of canvas