officers who advise a military leader and help to plan a military operation GrammarstaffStaff (sense 1) can be singular:a staff of ten (= a group of ten people) or plural:I have ten staff working for me. If it is the subject of a verb, this verb can be singular or plural:The staff in this store is/are very helpful.The plural form staffs is less frequent but is sometimes used to refer to more than one group of people:the senator and her staff (singular) senators and their staffs (plural).
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Check pronunciation: general staff