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

Working in batches, add 2 meatballs to skillet; flatten each to 1/4-inch thickness using a wide sturdy spatula. —Jasmine Smith, Southern Living, 9 May 2026

By the Second World War, the steel alloys had improved in composition, metal fabrication methods made armor more homogeneous, and the thickness was increased to create much tougher plating. —David Szondy may 07, New Atlas, 7 May 2026

Place bulb, cut end up, in a custard cup or on a double thickness of foil. —Jessica Saari Christensen, Better Homes & Gardens, 7 May 2026

The competition, Wardlaw explained, has changed because World Athletics, the sport’s governing body, limits the sole thickness of road shoes to 40mm. —Liam Tharme, New York Times, 7 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