(uncountable) The property of being thick (in dimension).

(uncountable, countable) A measure of how thick (in dimension) something is.

(countable) A layer.

(uncountable) The quality of being thick (in consistency).

(uncountable, informal) The property of being thick (slow to understand).

(graph theory, countable) The minimum number of planar subgraphs which a given graph can decompose into.

(transitive) To trim (wood) to a consistent thickness using a thickness planer.