[n] measuring instrument consisting of two graduated arms hinged at one end
[n] a particular aspect of life or activity; "he was helpless in an important sector of his life"
[n] a body of people who form part of society or economy; "the public sector"
[n] a portion of a military position
[n] the minimum track length that can be assigned to store information; unless otherwise specified a sector of data consists of 512 bytes
[n] a plane figure bounded by two radii and the included arc of a circle