Related formsun·prec·e·dent·ed·ly, adverbun·prec·e·dent·ed·ness, noun
- without previous instance; never before known or experienced; unexampled or unparalleled: an unprecedented event.
Synonyms for unprecedented
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for unprecedentedness
Derived Formsunprecedentedly, adverb
- having no precedent; unparalleled
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
Word Origin and History for unprecedentedness
1620s, from un- (1) "not" + precedented. In common use from c.1760.
Online Etymology Dictionary, © 2010 Douglas Harper