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Sector

ˈsɛktə

Sector definitions
noun
sector sectors
  1. an area or portion that is distinct from others

    "operations in the southern sector of the North Sea"

    • a distinct part or branch of a nation's economy or society or of a sphere of activity such as education

      "the government aimed to reassure the industrial and commercial sector"

    • a subdivision of an area for military operations
    • 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