formal
: for each day : per day
Employees will be given $20 per diem for expenses.
plural per diems
US
: an amount of money given to someone for daily expenses (such as food or fuel)
He received a $30 per diem for food.
Cite this Entry
“Per diem.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/per%20diem. Accessed 19 Jun. 2026.
Copy Citation
