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
Other considerations include matching the frame to your mattress’s thickness and leaving about 24 inches of walking space around the bed.
—
Sharon Brandwein, USA Today, 4 Apr. 2026
This technique enables precise control over the coating thickness and uniformity, potentially improving performance while reducing material usage and production costs.
—Prabhat Ranjan Mishra, Interesting Engineering, 4 Apr. 2026
In Indonesia, where plastic prices have doubled in the past month, companies are reducing the thickness of packaging material, according to the Indonesian Packaging Federation.
—Stephanie Yang, CNN Money, 4 Apr. 2026
Once the oil shimmers, add the frozen fish sticks and cook until heated through and golden brown, 3 to 5 minutes per side, depending on thickness.
—Kelly McCarthy, ABC News, 2 Apr. 2026
See All Example Sentences for thickness
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Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
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Sharon Brandwein, USA Today, 4 Apr. 2026
This technique enables precise control over the coating thickness and uniformity, potentially improving performance while reducing material usage and production costs.
—Prabhat Ranjan Mishra, Interesting Engineering, 4 Apr. 2026
In Indonesia, where plastic prices have doubled in the past month, companies are reducing the thickness of packaging material, according to the Indonesian Packaging Federation.
—Stephanie Yang, CNN Money, 4 Apr. 2026
Once the oil shimmers, add the frozen fish sticks and cook until heated through and golden brown, 3 to 5 minutes per side, depending on thickness.
—Kelly McCarthy, ABC News, 2 Apr. 2026
See All Example Sentences for thickness
Cite this Entry
“Thickness.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/thickness. Accessed 9 Apr. 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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