/ Dictionary / Index M milelong: Meaning and Definition of Find definitions for: mile•long Pronunciation: (mīl'lông", -long"), [key] — adj. extending for a mile: a milelong beach. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mileage ticket mile-marker Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language