/ Dictionary / Index U unprecedented: Meaning and Definition of Find definitions for: un•prec•e•dent•ed Pronunciation: (un-pres'i-den"tid), [key] — adj. without previous instance; never before known or experienced; unexampled or unparalleled: an unprecedented event. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: unprecedented (Thesaurus) unpracticed unpredictable Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language