Definitions from Wiktionary (sector)

▸ noun:  A section.
▸ noun:  A zone; a designated area.
▸ noun:  (military) An area designated by boundaries within which a unit operates, and for which it is responsible.
▸ noun:  (military) One of the subdivisions of a coastal frontier.
▸ noun:  (science fiction) a fictional region of space designated for navigational or governance purposes.
▸ noun:  (micronationalism) A community or subculture within the wider intermicronational community.
▸ noun:  (geometry) Part of a circle, extending to the center; circular sector.
▸ noun:  (computer hardware) A fixed-sized unit (traditionally 512 bytes) of sequential data stored on a track of a digital medium.
▸ noun:  (calculation) An instrument consisting of two rulers of equal length joined by a hinge.
▸ noun:  A field of economic activity.
▸ noun:  (engineering) A toothed gear whose face is the arc of a circle.
▸ noun:  (motor racing) A fixed, continuous section of the track, such that sectors do not overlap but all sectors make up the whole track.
▸ noun:  (climbing) An area of a crag, consisting of various routes
▸ Also see sector

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