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

Hillsides covered in fuel The hills surrounding Concepción, Penco and Lirquén appear deep green from the air, carpeted in trees, and in the thickness of these forests lies an insidious risk. —Stefano Pozzebon, CNN Money, 26 Apr. 2026

MacRumors thinks this could end up reducing the thickness of the iPhone’s display stack while improving brightness and minimizing power use. —Will McCurdy, PC Magazine, 25 Apr. 2026

This can take up to 24 hours, depending on the thickness of the wood. —Stacey Lastoe, Southern Living, 23 Apr. 2026

Line with a double thickness of foil. —Holly Riordan, Better Homes & Gardens, 22 Apr. 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