- 1 [uncountable, countable] the size of something between opposite surfaces or sides synonym width Use wood of at least 5 in. thickness. Cook for about 10 minutes, depending on the thickness of the steaks. Roll out the pastry to a thickness of a half inch. The walls are at least two feet in thickness. The board is available in four thicknesses.
- 2[countable] thickness (of something) a layer of something The jacket was lined with a double thickness (= two layers) of fabric.
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