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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
First recorded in 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. 2017.
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Examples from the Web for unprecedented
Contemporary Examples
Historical Examples
  • It was the sensation of an unprecedented and incredible experience.

    The Secret Agent Joseph Conrad
  • All here is so unprecedented, so changed, so sudden and unfair, that I am absolutely lost.

    A Tale of Two Cities Charles Dickens
  • Galusha had what was, for him, an amazing and unprecedented inspiration.

    Galusha the Magnificent Joseph C. Lincoln
  • "Both sides fought with unprecedented frenzy," said a resident to us.

    Aztec Land Maturin M. Ballou
  • If so, he had performed an unprecedented feat in recalling it so aptly.

    Peak and Prairie Anna Fuller
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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