1
a
: the distance between the top and bottom or front and back surfaces of something : a measurement of how thick something is
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/chops.
b
: the quality of being thick
I added flour to increase the gravy's thickness.
I was surprised by the thickness of his accent.
2
: a layer or sheet of some material
—usually + of
a single thickness of canvas/foil/cloth
Cite this Entry
“Thickness.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/thickness. Accessed 16 Apr. 2026.
Copy Citation
