unprecedented

[uhn-pres-i-den-tid]
adjective
without previous instance; never before known or experienced; unexampled or unparalleled: an unprecedented event.

Origin:
1615–25; un-1 + precedent + -ed2

unprecedentedly, adverb
unprecedentedness, noun


unique, extraordinary, exceptional, novel.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unprecedented (ʌnˈprɛsɪˌdɛntɪd)
 
adj
having no precedent; unparalleled
 
un'precedentedly
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

unprecedented
1623, from un- (1) "not" + precedented (see precedent (n.)). In common use from c.1760.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
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.
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