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
Poor sleep and stress can take a toll on skin, while exercise can improve blood flow to the skin and may help counteract the loss of elasticity and dermal thickness that comes with aging.
—
Maria Godoy, NPR, 20 Oct. 2025
In the United States, it is used in medical devices and measurement gauges, such as industrial devices that measure the thickness of materials.
—Taylor Ardrey, USA Today, 20 Oct. 2025
An approximate 30mm gap between the Y70 Touch Infinite’s interior floor and exterior bottom panel is designed to hold up to three 120mm or two 140mm fans at the most common 1-inch (around 25mm) thickness.
—PC Magazine, 18 Oct. 2025
The complex covers roughly 86,000 square feet and features extensive walls, which measure about 8 feet in thickness.
—Brendan Rascius, Miami Herald, 17 Oct. 2025
See All Example Sentences for thickness
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Maria Godoy, NPR, 20 Oct. 2025
In the United States, it is used in medical devices and measurement gauges, such as industrial devices that measure the thickness of materials.
—Taylor Ardrey, USA Today, 20 Oct. 2025
An approximate 30mm gap between the Y70 Touch Infinite’s interior floor and exterior bottom panel is designed to hold up to three 120mm or two 140mm fans at the most common 1-inch (around 25mm) thickness.
—PC Magazine, 18 Oct. 2025
The complex covers roughly 86,000 square feet and features extensive walls, which measure about 8 feet in thickness.
—Brendan Rascius, Miami Herald, 17 Oct. 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 23 Oct. 2025.
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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