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Definition of sector:

  1. 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.
  2. A part of a circle comprehended between two radii and the included arc.

Synonyms:

firmament, sphere of influence, arena, sphere, orbit, empyrean, celestial sphere, welkin, heavens, vault of heaven.

Usage examples: