1. The property of being thick (in dimension).
  2. A measure of how thick (in dimension) something is.
    The thickness of the Earth's crust is varies from two to 70 kilometres.
  3. A layer.
    We upholstered the seat with three thicknesses of cloth to make it more comfortable to sit on.
  4. The quality of being thick (in consistency).
    Whip the cream until it reaches a good thickness.
  5. The property of being thick (slow to understand).

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