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Definition of: sector
(sek′tər) noun
1. Geom. A part of a circle bounded by two radii and the arc subtended by them.
2. A mathematical instrument consisting of two arms marked with various scales and hinged together at one end.
3. Mil. A part of a front in contact with the enemy.
—v.t. To divide into sectors. [<LL <L, a cutter <sectus, pp. of secare cut]
abc is a sector of the circle.
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