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

Waterproof touch controls, five presets, and the ability to customize thickness have made this a best seller. — Sarah Scott, Southern Living, 16 July 2026

The Premium collection ranges from 4-6 mm in thickness, while their Performance collection extends to 8 mm thick. — Bestreviews, Mercury News, 14 July 2026

While some hair products can be used across different textures, lengths, curl patterns, thicknesses, and colors (natural and unnatural), they are often created with specific consumers in mind. — Catharine Malzahn, Allure, 13 July 2026

Even with unusual thickness, the battery’s electrolyte still allowed more than half of the lithium to be successfully extracted. — Mrigakshi Dixit, Interesting Engineering, 13 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