[chief of staff] (ca. 1881) 1: the ranking officer of a staff in the armed forces serving as principal adviser to a commander
2: the commanding officer of the army or air force and a member of the Joint Chiefs of Staff
[chief of staff] (ca. 1881) 1: the ranking officer of a staff in the armed forces serving as principal adviser to a commander
2: the commanding officer of the army or air force and a member of the Joint Chiefs of Staff
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012