sector

Etymology

Borrowed from Latin sector.

noun

1. A section.
2. A zone; a designated area.
   1. (military) An area designated by boundaries within which a unit operates, and for which it is responsible.
   2. (military) One of the subdivisions of a coastal frontier.
   3. (science fiction) a fictional region of space designated for navigational or governance purposes.
3. (geometry) Part of a circle, extending to the center; circular sector.
4. (computer hardware) A fixed-sized unit (traditionally 512 bytes) of sequential data stored on a track of a digital medium.
   Coordinate term: block
5. (calculation) An instrument consisting of two rulers of equal length joined by a hinge.
6. A field of economic activity.
   Seeing the British establishment struggle with the financial sector is like watching an alcoholic who still resists the idea that something drastic needs to happen for him to turn his life around. Until 2008 there was denial over what finance had become. When a series of bank failures made this impossible, there was widespread anger, leading to the public humiliation of symbolic figures. 2013-06-28, Joris Luyendijk, “Our banks are out of control”, in The Guardian Weekly, volume 189, number 3, page 21
   public sector; private sector
7. (engineering) A toothed gear whose face is the arc of a circle.
8. (motor racing) A fixed, continuous section of the track, such that sectors do not overlap but all sectors make up the whole track.
9. (climbing) An area of a crag, consisting of various routes