Definitions for: Sector


[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



Webster (1913) Definition: Sec"tor, n. [L., properly, a cutter, fr. secare,
sectum, to cut: cf. F. secteur. See Section.]
1. (Geom.) A part of a circle comprehended between two radii
and the included arc.

2. 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.

3. 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.

Dip sector, an instrument used for measuring the dip of the
horizon.

Sector of a sphere, or Spherical sector, the solid
generated by the revolution of the sector of a circle
about one of its radii, or, more rarely, about any
straight line drawn in the plane of the sector through its
vertex.

Synonyms: sphere

See Also: allocation unit, arc, aspect, battlefield, battleground, black economy, block, body, business, business sector, computer memory unit, department, economic system, economy, facet, field, field of battle, measuring device, measuring instrument, measuring system, parcel, parcel of land, piece of ground, piece of land, plane figure, society, tract, two-dimensional figure

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