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

The collection recreates the grain, density, and irregular character of the material through an interplay of textures and thicknesses. — Sofia Celeste, Footwear News, 23 July 2026

Samsung says this layer is one-third the thickness of a human hair. — Eric Zeman, PC Magazine, 22 July 2026

Rose also recommends adding extra hair to bump up the thickness and length. — Ariana Yaptangco, InStyle, 21 July 2026

This kind of construction allows for all sorts of first and third-party strap designs, while keeping device thickness and weight to a minimum in this basic strap arrangement. — Andrew Williams, Forbes.com, 20 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