|1.||a part or subdivision, esp of a society or an economy: the private sector|
|2.||geometry either portion of a circle included between two radii and an arc. Area: ½r²θ, where r is the radius and θ is the central angle subtended by the arc (in radians)|
|3.||a measuring instrument consisting of two graduated arms hinged at one end|
|4.||a part or subdivision of an area of military operations|
|5.||computing the smallest addressable portion of the track on a magnetic tape, disk, or drum store|
|[C16: from Late Latin: sector, from Latin: a cutter, from secāre to cut]|
|sector (sěk'tər) Pronunciation Key
The part of a circle bounded by two radii and the arc between them.