The definition of a sector is a separate or distinct area or part of something larger.(noun)
The part of the economy controlled by technology companies is an example of the tech sector.
See sector in Webster's New World College Dictionary
Origin: LL < L, cutter < sectus, pp. of secare, to cut: see saw
See sector in American Heritage Dictionary 4
Origin: Late Latin
Origin: , from Latin, cutter
Origin: , from sectus
Origin: , past participle of secāre, to cut; see sek- in Indo-European roots.
Learn more about sector