Read the dictionary definition of sector. All definitions for this word.
1. measuring instrument consisting of two graduated arms hinged at one end
2. a particular aspect of life or activity
1. he was helpless in an important sector of his life
3. a social group that forms part of the society or the economy
1. the public sector
4. a portion of a military position
5. the minimum track length that can be assigned to store information; unless otherwise specified a sector of data consists of 512 bytes
6. a plane figure bounded by two radii and the included arc of a circle