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1an 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 business sector of the city Military a subdivision of an area for military operations. Computing a subdivision of a track on a magnetic disk.
2the plane figure enclosed by two radii of a circle or ellipse and the arc between them.
3a mathematical instrument consisting of two arms hinged at one end and marked with sines, tangents, etc., for making diagrams.