Definition of sectors:
(n) :
A section.
(n) :
(aviation) In the schedule for an aircraft and its crew, the period starting with preparation of the plane before loading at one airport and ending with deplaning at the next.
(n) :
A zone; a designated area.
(n) :
(military) An area designated by boundaries within which a unit operates, and for which it is responsible.
(n) :
(military) One of the subdivisions of a coastal frontier.
(n) :
(science fiction) a fictional region of space designated for navigational or governance purposes.