chief of staff

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chief of staff noun
plural chiefs of staff
chief of staff
noun
plural chiefs of staff
Learner's definition of CHIEF OF STAFF
[count]
: a person of high rank in the U.S. Army, Navy, Air Force, or Marines who advises the person in charge of military operations see also joint chiefs of staff
: a person of high rank who advises a leader (such as the U.S. President) on important matters
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