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unprecedented

[uhn-pres-i-den-tid]

Origin

adjective

without previous instance; never before known or experienced; unexampled or unparalleled: an unprecedented event.

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

Related forms

un·prec·e·dent·ed·ly, adverb

un·prec·e·dent·ed·ness, noun

Synonyms
unique, extraordinary, exceptional, novel.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Unprecedented has a plethora of syllables.

So is pneumonoultramicroscopicsilicovolcanoconiosis. Does it mean:

an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language.

given to using long words.

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Collins

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.

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