Breadcrumb Home > Dictionary > Index U umpteenth: Meaning and Definition of Find definitions for: ump•teenth Pronunciation: (ump'tēnth'), [key] — adj. Informal. of an indefinitely large number in succession: He was the umpteenth person to arrive. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: umpteenth (Thesaurus) umpteen umpty-umpth TrendingHere are the facts and trivia that people are buzzing about. Ramadan and Eid al-Fitr 42 Best War Movie Quotes Current Events This Week: March 2023 Recycling Facts William Shakespeare Worst U.S. Forest Fires ✖ Related Content Daily Word Quiz: recreant Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language