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

Depending on the thickness setting, the machine will take anywhere from 15 minutes to a little over an hour to finish a freezing cycle. —Wilder Davies, Bon Appetit Magazine, 7 Oct. 2025

When buying a toaster, consider its ability to hold various bread thicknesses and provide even browning. —Tammy Algood, Nashville Tennessean, 6 Oct. 2025

Borovinsky confesses this may not be the best pillow for stomach sleepers, as its thickness might make stomach or side sleepers a bit uncomfortable. —Julia Harrison, Architectural Digest, 6 Oct. 2025

Further investigation of human brain scans found that skull thickness had been altered by the tumors, particularly where bones fuse. —New Atlas, 6 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