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

Great for the upper and middle back, helping to build thickness and definition. —Ciara Lucas, SELF, 15 Feb. 2026

Healthy roots will appear moist and will taper in thickness closer to the tip. —Michele Laufik, Martha Stewart, 10 Feb. 2026

According to the town’s website, the town takes weekly ice measurements to judge the thickness of the ice around the track during winters in which the loops are open. —The Summit Daily, Denver Post, 10 Feb. 2026

In a six-month 2018 study, women who took Nutrafol experienced significant improvements in hair growth, volume, thickness, and overall quality. —Rebecca Strong, USA Today, 10 Feb. 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