The term 'staff-level' combines 'staff,' originating from Old English 'stæf,' meaning 'stick or rod,' and 'level,' from Old French 'level,' meaning 'a horizontal position.'

'Staff' evolved from Old English 'stæf' to Middle English 'staff,' while 'level' transitioned from Old French 'level' to Middle English 'level.'

Initially, 'staff' referred to a 'stick or rod,' but evolved to mean 'a group of employees,' while 'level' maintained its meaning of 'position or rank.'