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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

domain, area, territory, patch, section, region, district, rood, hectare, acre, zone

duchy, municipality, colony, Shire, country, field, borough, neighborhood, city, tract, bailiwick, empire, canton, circuit, state, province, dukedom, town, locality, plot, earldom, precinct, kingdom, beat, county, commonweal, quarter, realm, place, nation, riding

provincial, local, regional, territorial, divisional, national, commonwealth, colonial

percentage, proportion, allotment, quantum, part, stake, helping, fraction, budget, lot, piece, interest, member, parcel, slice, segment, measure, cut, subdivision, stock, half, allowance, split, bit, commission, chunk, share, partition, ration, division, dividend, portion, compartment, quota

Usage examples:

• The boys have everything under control in this sector," Allison added. - "A Yankee Flier in Italy", Rutherford G. Montgomery.
• " Well, our luck's run out, on that sector; we have troubles there, now. - "Last Enemy", Henry Beam Piper.
• Over the past year, our Task Force on Private Sector Initiatives has successfully forged a working partnership involving leaders of business, labor, education, and government to address the training needs of American workers. - "State of the Union Addresses of Ronald Reagan", Ronald Reagan.