/ Dictionary / Index U umpteen: Meaning and Definition of Find definitions for: ump•teen Pronunciation: (ump'tēn'), [key] — adj. Informal. innumerable;many. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: umpteen (Thesaurus) umpire umpteenth Related Content Daily Word Quiz: pristine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language