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

• consistence
• consistency
• density
• viscidity
• viscosity

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

Depending on the steel's thickness, a loop can stretch up to tens of thousands of feet, Modesitt said. —Judith Kohler, Denver Post, 7 May 2025

The video compares the dummy of the 17 Air to the current iPhone 16 Pro, and the difference in thickness is striking — and the difference will be even more pronounced if rumors about the iPhone 17 Pro Max design prove true. —David Phelan, Forbes.com, 5 May 2025

Start by grinding up your coffee beans with the 30 different grinding thickness options. —Christopher Murray, FOXNews.com, 21 Apr. 2025

The large glass window looking into the studio was made with multiple panes of glass of different thicknesses. —Tim Carter, Hartford Courant, 19 Apr. 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