noun

1. part of a circle bounded by any two radii and the arc included between them
2. a mathematical instrument consisting of two rulers marked with various scales and jointed together at one end, used in solving problems, measuring angles, etc.
3. any of the districts into which an area is divided for military operations
4. a distinct part of society or of an economy, group, area, etc.; section; segment

Etymology: LL < L, cutter < sectus, pp. of secare, to cut: see saw

transitive verb