unprecedented
Americanadjective
adjective
Other Word Forms
- unprecedentedly adverb
- unprecedentedness noun
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
Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!
The New SAT: Words to Capture Tone
Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!
Fast Food Nation
Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!
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.
But Anthropic’s Claude Mythos model shows that these rapid advancements could have unprecedented consequences if the technology falls into the wrong hands.
From MarketWatch • Apr. 18, 2026
He said the approach addresses “complex challenges created by these unprecedented drought conditions which require immediate action.”
From Los Angeles Times • Apr. 17, 2026
It’s unprecedented, Sinnar explained, because the state-level designation, while distinct, goes beyond the federal law governing the designation of terrorist organizations, which have been restrained by the First Amendment.
From Salon • Apr. 17, 2026
Today’s inflationary pressure and geopolitical tensions have catapulted its price to unprecedented heights.
From The Wall Street Journal • Apr. 16, 2026
With his passing, he evaded the overwhelming consequence of his success: the challenge of consolidating a polyglot empire unprecedented in size and comprising peoples who, by and large, despised each other.
From "Circumference" by Nicholas Nicastro
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.
