chief of staff
noun phraseDefinition of chief of staff
1
: the ranking officer of a staff in the armed forces serving as principal adviser to a commander
2
: the ranking officer of the army or air force and a member of the Joint Chiefs of Staff
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“Chief of staff.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/chief%20of%20staff. Accessed 11 Aug. 2022.
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The first known use of chief of staff was in 1862
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