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per mill

American  
[pur mil, per] / ˌpɜr ˈmɪl, pər /
Or per mil

adverb

  1. per thousand.


per mill British  
/ pə ˈmɪl /

adverb

  1. by the thousand or in each thousand

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of per mill

First recorded in 1900–05