per mill

or per mil

[ pur mil, per ]
/ ˌpɜr ˈmɪl, pər /

adverb

per thousand.

Origin of per mill

First recorded in 1900–05

British Dictionary definitions for per mill

per mill

per mil

/ (pə ˈmɪl) /

adverb

by the thousand or in each thousand

Word Origin for per mill

C19: from per + French or Latin mille thousand, on the model of per cent