/ Dictionary / Index R run-on: Meaning and Definition of Find definitions for: run-on Pronunciation: (run'on", -ôn"), [key] — adj. of or designating something that is added or run on: a run-on entry in a dictionary. (of a line of verse) having a thought that carries over to the next line, esp. without a syntactical break. —n. run-on matter. after-run. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: run-on (Thesaurus) run-of-the-mine run-on sentence Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language