sector

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sec·tor / ˈsektər/ • n. 1. an area or portion that is distinct from others. ∎  a distinct part or branch of a nation's economy or society or of a sphere of activity such as education: the industrial and commercial sector the Muslim sector of the village. ∎  Mil. a subdivision of an area for military operations. ∎  Comput. a subdivision of a track on a magnetic disk.2. the plane figure enclosed by two radii of a circle or ellipse and the arc between them.3. a mathematical instrument consisting of two arms hinged at one end and marked with sines, tangents, etc., for making diagrams.DERIVATIVES: sec·tor·al / -rəl/ adj.

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