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

Rocket Lab also deleted joints in the first stage tank structure and increased the thickness of some sections of the carbon composite. — Stephen Clark, ArsTechnica, 15 Oct. 2026

Measuring as thin as a quarter of the thickness of human hair, the transparent liner provides scientists a window to monitor growth. — Sal Vaglica, Time, 15 Oct. 2026

Woolmark’s research summary describes tests using sweating manikins and human participants to compare wool, cotton, viscose and polyester garments of similar weight and thickness. — Alexandra Harrell, Footwear News, 14 Oct. 2026

Their small thickness could allow manufacturers to stack computing and memory components vertically, reducing the distance data travels between them. — Neetika Walter, Interesting Engineering, 13 Oct. 2026

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