per diem

adverb | \ pər-ˈdē-əm, -ˈdī- \ | per di·em

1. : by the day : for each day paid per diem

adjective

1. : based on use or service by the day per diem compensation

2. : paid or calculated by the day per diem interest

noun

1. : a daily allowance received a per diem for expenses

2. : a daily fee paid a per diem for maintenance of the equipment