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

This recipe, slightly adapted for thickness, provides a just-charred, roasted edge to the classic tomato soup due to broiling a heaping pile of vegetables together. — Jack Dolan, Los Angeles Times, 22 Oct. 2026

The trays are typically two feet long and can hold hundreds of pieces of mail, depending on their size and thickness. — Kelsy Mittauer, CBS News, 22 Oct. 2026

On the epidermal front, estrogen helps maintain the thickness and elasticity that make our skin look firm and bouncy. — Ashley Abramson, Allure, 22 Oct. 2026

The machine can't teach your eyes what a good weld looks like just because the display knows the material thickness. — New Atlas, 22 Oct. 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