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

Anya Freeman, founder of KIND Designs, said current regulations cap seawall thickness at 18 inches. —Ashley Miznazi, Miami Herald, 20 Mar. 2026

But, because this common internet hack lacks the flavor, thickness, and baking prowess of cultured buttermilk, many professionals don’t recommend it. —Emily Saladino, Bon Appetit Magazine, 20 Mar. 2026

The varying thicknesses are so slight that my hands didn't notice them during day-to-day usage. —Iyaz Akhtar, PC Magazine, 20 Mar. 2026

The biggest lick, or score, was often jewelry, gold pieces that the woman could melt down into untraceable bars the length and width of a credit card, the thickness of a bar of chocolate. —Alex Morris, Rolling Stone, 19 Mar. 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