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

Aim for a thickness of 2 to 3 inches when applying organic matter such as wood chips, bark, or straw. —Sj McShane, Martha Stewart, 31 May 2026

The Italian Leather Lug Sole Fisherman Sandals, however, boast a visible arch contour, a midsole thickness, adjustable straps, and shock-absorbing ortholite insoles—all of which are reasons why both podiatrists approve. —Olivia Cigliano, InStyle, 29 May 2026

The Oura Ring 5 is 40% smaller overall than its predecessor, bringing its size and thickness more in line with an ordinary wedding band. —Bloomberg, Mercury News, 28 May 2026

Once the sheet reaches the right thickness, temperature adjustments consolidate the ice properties. —Deena Theresa, Interesting Engineering, 28 May 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