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.
When the Knicks walloped the Philadelphia 76ers in Game 1 of their second-round series Monday night, by the absurd score of 137-98, it extended an unprecedented three-game streak of one-sided victories.
From The Wall Street Journal • May 5, 2026
If a new world hantavirus is being transmitted between humans on this ship, that would be unprecedented, to my knowledge.
From Barron's • May 4, 2026
It spans 21 generations and includes more than 400 individuals, creating the foundation for an unprecedented attempt to rebuild Leonardo's genetic profile.
From Science Daily • May 4, 2026
European leaders are descending on Armenia for two unprecedented summits in a country long considered Russia's closest ally in the South Caucasus.
From BBC • May 3, 2026
“But I can understand your jealousy, Hugh. It promises to be a work unprecedented in the history of academic scholarship.”
From "Miss Peregrine's Home for Peculiar Children" by Ransom Riggs
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.
