sector (n.)

• adjunct
• component
• contingent
• crescent
• detachment
• detail
• district
• division
• dole
• fraction
• hemicycle
• installment
• item
• parcel
• part
• particular
• percentage
• portion
• precinct
• quadrant
• quarter
• quota
• remainder
• sample
• sampling
• section
• segment
• semicircle
• sextant
• share
• subdivision
• subgroup
• subspecies