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

• 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

Use the bottom of a heavy glass or measuring cup to smash carrots, without breaking them, to about 1/2-inch thickness. —Madalyn Bendgen, Better Homes & Gardens, 29 Oct. 2025

The pillow’s thickness is laud-worthy. —Julia Harrison, Architectural Digest, 24 Oct. 2025

The type of material used and the thickness of the fabric determine the warmth of flannel. —Bestreviews, Mercury News, 24 Oct. 2025

The team members measured the thickness and location of different rock layers, collected samples for testing and identified all of the spots where fossils were found over the last century and a half. —Ashley Strickland, CNN Money, 23 Oct. 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