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unprecedented

[uhn-pres-i-den-tid] /ʌnˈprɛs ɪˌdɛn tɪd/
adjective
1.
without previous instance; never before known or experienced; unexampled or unparalleled:
an unprecedented event.
Origin
1615-1625
1615-25; un-1 + precedent + -ed2
Related forms
unprecedentedly, adverb
unprecedentedness, noun
Synonyms
unique, extraordinary, exceptional, novel.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for unprecedentedly

unprecedented

/ʌnˈprɛsɪˌdɛntɪd/
adjective
1.
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 unprecedentedly

unprecedented

adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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