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

• consistence
• consistency
• density
• viscidity
• viscosity

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 until an instant-read thermometer inserted into the thickest part the chicken registers 165 degrees, 10 to 14 minutes longer, depending on thickness. —Lynda Balslev, Mercury News, 21 May 2025

For comparison, the Galaxy S25 Edge measures 5.8mm in thickness. —Prakhar Khanna, Forbes.com, 16 May 2025

The formula plays well with all hair textures and thicknesses, adding silkiness without weighing things down (just don't overdo it—a little goes a long way). —Amanda Mitchell, Allure, 16 May 2025

Reducing the thickness of current collectors is one of the key ways of reducing the size of energy storage devices. —IEEE Spectrum, 10 May 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