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

In fact, doing it properly is an art form of sorts, with layering requiring the right mix of textures, metals, and ring thicknesses to build out a covetable final look that doesn’t feel burdensome on your finger. —Stacia Datskovska, Footwear News, 11 Nov. 2025

Their moderate thickness yet breathable microfiber material keeps your feet toasty and snug, and the vibrant colors make wearing these that much more fun (the blue ones are my favorite). —Julia Morlino, Travel + Leisure, 11 Nov. 2025

The study also provides a previously unidentified constraint for models of tidal heat production, shell thickness, and the long-term evolution of Enceladus’ ocean. —Bojan Stojkovski, Interesting Engineering, 10 Nov. 2025

Doctors track the thickness of the carotid artery wall as an early warning sign for clogged arteries that can lead to heart attacks and strokes. —Deirdre Bardolf, FOXNews.com, 8 Nov. 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