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

• 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

Allow your spackle layer to dry completely (which could take several hours depending on thickness and humidity). —Elizabeth Fogarty, Better Homes & Gardens, 16 Aug. 2025

These scalp drops are designed with density in mind and can improve thickness and volume for less shedding and thicker hairstyles. —Jessie Quinn, StyleCaster, 11 Aug. 2025

While no shampoo can reverse this process entirely, certain formulas contain ingredients that may preserve your scalp health and add thickness and volume. —Malia Griggs, Glamour, 8 Aug. 2025

The quick summary is that designers took a cue from animal fur, which is variable across their bodies, and made the insulation’s recycled polyester fibers in variable thicknesses and lengths. —Jakob Schiller, Outside, 7 Aug. 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