Definition of thickness noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈθɪknəs//
    ; NAmE NAmE//ˈθɪknəs//
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  1. 1  [uncountable, countable] the size of something between opposite surfaces or sides synonym width Use wood of at least 12 mm thickness. Cook for about 10 minutes, depending on the thickness of the steaks. Roll out the pastry to a thickness of 1 cm. The walls are at least two feet in thickness. The board is available in four thicknesses.
  2. 2[countable] thickness (of something) a layer of something The jacket was lined with a double thickness (= two layers) of fabric.
  3. Word OriginOld English thicness (see thick, -ness).Extra examples The tank’s armour plate is 50mm in thickness. There’s a double thickness on the seat and knees of the trousers. Roll the pastry to a thickness of about 5  mm.
See the Oxford Advanced American Dictionary entry: thickness