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

Gattelli and this crew would have all kinds of fun there and the central Act One gag would not have felt a little stretched beyond its natural thickness. —Chris Jones, New York Daily News, 21 Apr. 2026

The exact timing depends on the shape, thickness, and whether the pasta contains a filling. —Olivia McIntosh, Martha Stewart, 16 Apr. 2026

Don’t be afraid to hang an oversized mirror above the sink—just make sure to consider the thickness of the frame, so as to not take up unnecessary visual weight. —Fiona Bornhöft, Architectural Digest, 15 Apr. 2026

In court documents, an Angels employee alleged the ice cream’s thickness often broke ballpark machines. —Sam Blum, New York Times, 13 Apr. 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