Set, n. 1. (Textiles) Any of various standards of measurement of the fineness of cloth; specif., the number of reeds in one inch and the number of threads in each reed. The exact meaning varies according to the location where it is used. Sometimes written sett.
2. A stone, commonly of granite, shaped like a short brick and usually somewhat larger than one, used for street paving. Commonly written sett.
3. Camber of a curved roofing tile.
4. The manner, state, or quality of setting or fitting; fit; as, the set of a coat.