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

Their midweight thickness offers enough cushion for miles of walking through the streets of New York City, without causing sweat. —Ali Faccenda, PEOPLE, 8 Jan. 2026

The thickness of this layer causes light interference effects, giving the fabric a vivid purple appearance similar to the colors seen in soap bubbles. —Prabhat Ranjan Mishra, Interesting Engineering, 5 Jan. 2026

Winter-ready Legging thickness varies depending on the brand. —Bestreviews, Chicago Tribune, 5 Jan. 2026

Introducing an active vibration system to the equation might require a change in the thickness of the seat foam, the ergonomics, and vibration isolation. —New Atlas, 4 Jan. 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