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
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 there are certainly products that can be used across different hair textures, lengths, curl patterns, thicknesses, colors (natural and unnatural), and needs, hair products are often created with specific consumers in mind.
—
Jailynn Taylor, Allure, 31 Dec. 2025
Honey is known for its antibacterial properties, Wick said, and its thickness may shield your sore throat from further irritation.
—The Washington Post, San Diego Union-Tribune, 30 Dec. 2025
Every single facet, every line, the thickness, the color variation.
—Hedy Phillips, PEOPLE, 29 Dec. 2025
Lightweight, all-season, or ultrawarm thicknesses are available depending on your sleeping preferences, and it’s backed by 1,000-plus five-star reviews.
—Kate McGregor, Architectural Digest, 26 Dec. 2025
See All Example Sentences for thickness
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Jailynn Taylor, Allure, 31 Dec. 2025
Honey is known for its antibacterial properties, Wick said, and its thickness may shield your sore throat from further irritation.
—The Washington Post, San Diego Union-Tribune, 30 Dec. 2025
Every single facet, every line, the thickness, the color variation.
—Hedy Phillips, PEOPLE, 29 Dec. 2025
Lightweight, all-season, or ultrawarm thicknesses are available depending on your sleeping preferences, and it’s backed by 1,000-plus five-star reviews.
—Kate McGregor, Architectural Digest, 26 Dec. 2025
See All Example Sentences for thickness
Cite this Entry
“Thickness.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/thickness. Accessed 1 Jan. 2026.
Copy CitationKids 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
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