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

While the rear of the keyboard deck does jut out a little around the USB-C ports, everything else appears to be around half the thickness. — Jon Martindale, PC Magazine, 7 Aug. 2026

The thickness increases as 2 to the power of the number of folds. — Phil Plait, Scientific American, 7 Aug. 2026

Nutrition info refers to 56 grams, about 2-3 slices of turkey, depending on size and thickness. — Jolene Thym, Mercury News, 5 Aug. 2026

Standouts include prebiotics and probiotics to help balance the scalp biome, salicylic acid to slough away dry skin and stave off flakiness, and biotin to support thickness once growth kicks into gear. — Annie Blackman, InStyle, 2 Aug. 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