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

Cook for 30–40 minutes, depending on thickness, until the salmon flakes easily with a fork, the internal temperature reaches approximately 140°F and the edges are lightly caramelized and smoky. — Staff, FOXNews.com, 3 July 2026

Like other fibers, beta-glucan forms a gel in your stomach, which increases the thickness of food as it is digested. — Brittany Lubeck, Verywell Health, 2 July 2026

As expected, your hair texture, curl type, and thickness all affect which setting is right for you. — Sian Babish, PEOPLE, 1 July 2026

The cognitive dissonance contributed to the thickness in the air that week. — Julissa James, Los Angeles Times, 1 July 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