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per diem

1510s, "by the day, in each day," Latin, "by the day," from per (see per) + diem, accusative singular of dies "day" (from PIE root *dyeu- "to shine"). As a noun from 1809, "amount or allowance of so much every day."

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Definitions of per diem from WordNet
1
per diem (n.)
a daily allowance for living expenses (especially while traveling in connection with your job);
2
per diem (adv.)
one every day;
we'll save 100 man-hours per diem
Synonyms: by the day
From wordnet.princeton.edu