/ Dictionary / Index P per mill: Meaning and Definition of Find definitions for: per mill Pronunciation: (pûr" mil', pur), [key] per thousand. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Permic permillage Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language