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

These two steaks are different cuts, sizes and thicknesses, but the goal remains the same. — Los Angeles Times, 21 Aug. 2026

No tweak hits the ground without extensive testing, both with machinery and with athletes scrutinizing everything from grip strength to rubber thickness. — Tim Newcomb, Forbes.com, 21 Aug. 2026

The optical link must work through varying skin thickness, blood vessels, and hair, and tolerate imperfect alignment with the external headpiece. — Shannon Cuthrell, IEEE Spectrum, 20 Aug. 2026

Spiralizer blades can produce zucchini noodles in a range of thicknesses. — Andrea Beck, Better Homes & Gardens, 17 Aug. 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