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[uhn-pres-i-den-tid] /ʌnˈprɛs ɪˌdɛn tɪd/
without previous instance; never before known or experienced; unexampled or unparalleled:
an unprecedented event.
Origin of unprecedented
1615-25; un-1 + precedent + -ed2
Related forms
unprecedentedly, adverb
unprecedentedness, noun
unique, extraordinary, exceptional, novel. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for unprecedented
  • The level of ambition is exceptional, if not unprecedented.
  • He emphasized and supported the importance of education in a way that was perhaps unprecedented among his coaching colleagues.
  • To our knowledge this rapid growth of a new degree concept is unprecedented.
  • So the outlook for dividends, as reflected in swap prices, is historically unprecedented.
  • The scale and consequences of its currency regime are alike unprecedented.
  • Air travel has given entire populations unprecedented mobility.
  • Rising wealth and expectations of happiness are behind unprecedented demand for counselling as well as psychiatric care.
  • He had launched an unprecedented intervention in foreign-exchange markets to soften the unwanted appreciation of the zloty.
  • Yet over the past two years, companies around the globe have jumped into bed with each other on an unprecedented scale.
  • These are unprecedented levels for places unaffected by war or famine.
British Dictionary definitions for unprecedented


having no precedent; unparalleled
Derived Forms
unprecedentedly, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for unprecedented

1620s, from un- (1) "not" + precedented. In common use from c.1760.

Online Etymology Dictionary, © 2010 Douglas Harper
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