Most Helpful Girl
adverb & adjective
for each day (used in financial contexts).
"he agreed to pay at certain specified rates per diem"
an allowance or payment made for each day.
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Most Helpful Guy
It's usually used in the context of a job or contract when you travel for work. It's daily pay for expenses. It's in addition to your regular pay. In the US it's tax free. It's used instead of direct reimbursement for expenses.1