/ Dictionary / Index L long-run: Meaning and Definition of Find definitions for: long-run Pronunciation: (lông'run', long'-), [key] — adj. happening or presented over a long period of time or having a long course of performances: a long-run hit play. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: long-run (Thesaurus) long rifle long s Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language