a social group that forms part of the society or the economy
measuring instrument consisting of two graduated arms hinged at one end
a particular aspect of life or activity
a portion of a military position
the minimum track length that can be assigned to store information; unless otherwise specified a sector of data consists of 512 bytes
a plane figure bounded by two radii and the included arc of a circle
A part of a circle comprehended between two radii and the included arc.
A mathematical instrument, consisting of two rulers connected at one end by a joint, each arm marked with several scales, as of equal parts, chords, sines, tangents, etc., one scale of each kind on each arm, and all on lines radiating from the common center of motion. the sector is used for plotting, etc., to any scale.
An astronomical instrument, the limb of which embraces a small portion only of a circle, used for measuring differences of declination too great for the compass of a micrometer. when it is used for measuring zenith distances of stars, it is called a zenith sector.