unprecedented
Americanadjective
adjective
Other Word Forms
Etymology
Origin of unprecedented
Explanation
Something that is unprecedented is not known, experienced, or done before. If you've never gone on a family beach vacation but you're planning one now, you could refer to it as an unprecedented decision. The root of this word is precedent, a noun referring to something done or said that is used as an example to be followed in the future. In law, a precedent is a legal decision that is used as a standard in future cases. So the adjective unprecedented, meaning "having no precedent," was formed from the prefix un- "not," the noun precedent, and the suffix –ed "having."
Vocabulary lists containing unprecedented
The SAT: Words to Capture Tone, List 5
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The New SAT: Words to Capture Tone
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Fast Food Nation
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
“Everest: The Other Side,” from filmmakers Jimmy Chin and Elizabeth Chai Vasarhelyi, follows mountaineers Hilaree Nelson and Jim Morrison as they prepare to climb Everest’s north face and attempt an unprecedented ski descent.
From Los Angeles Times ● Sep. 3, 2026
"We have already announced unprecedented financial powers to English mayors so they can receive a share of income tax revenues to boost local economies and improve public services," they added.
From BBC ● Sep. 2, 2026
Moroccan security forces displayed "total permissiveness" during the unprecedented migrant rush into Spain's north African territory of Ceuta in July, according to a Spanish police report seen by AFP on Wednesday.
From Barron's ● Sep. 2, 2026
Snowfall in this famously dry region is not unprecedented.
From Science Daily ● Sep. 1, 2026
This would have brought about an unprecedented transformation in human capabilities and lifestyles.
From "Sapiens: A Brief History of Humankind" by Yuval Noah Harari
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
