/ Dictionary / Index M mile-marker: Meaning and Definition of Find definitions for: mile-mark•er Pronunciation: (mīl'mär"kur), [key] — n. a numbered milepost along a highway: used as a way of determining the exact location of a vehicle. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. milelong milepost Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language