/ Dictionary / Index M milline: Meaning and Definition of Find definitions for: mil•line Pronunciation: (mil'līn", mil-līn'), [key] — n. one agate line of advertising one column in width appearing in one million copies of a periodical. the charge or cost per milline. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: milline (Thesaurus) millimole milliner Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language