/ Dictionary / Index P permillage: Meaning and Definition of Find definitions for: per•mil•lage Pronunciation: (pur-mil'ij), [key] — n. a rate or proportion per thousand. Cf.(def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. per mill permissible 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