1per di·em 
/pɚˈdi:jəm/ adverb
/pɚˈdi:jəm/ adverb formal : for each day : per day
▪ Employees will be given $20 per diem for expenses.
▪ Employees will be given $20 per diem for expenses.
— per diem adjective always used before a noun
▪ a per diem allowance
▪ a per diem allowance
