404
Americannoun
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Also called 404 error. Computers. an error message sent by a web server to a browser when the user has typed an incorrect URL, tried to access a web page that is no longer available, or clicked on a broken link on a web page.
They must have taken down their website;
I keep getting that annoying “404 - File Not Found” message.
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Slang. a person who is stupid or uninformed.
noun
Etymology
Origin of 404
First recorded in 1995–2000
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.
Ultimately, the Dow Jones Industrial Average fell 404 points, or 0.8%.
From Barron's ● Mar. 4, 2026
The Dow Jones Industrial Average slid more than 1,200 points this morning before reversing course; it closed down 0.8%, or around 404 points.
From The Wall Street Journal ● Mar. 3, 2026
The company’s data-sharing with federal authorities and cybersecurity lapses have been documented by 404 Media and other outlets.
From Los Angeles Times ● Mar. 1, 2026
A Ring spokesperson defended the Search Party tool when reached for comment by 404.
From Salon ● Feb. 18, 2026
Olanna watched the Peugeot 404 disappear down the road and stood there for a while, feeling as if she had swallowed a sparkling sliver of light.
From "Half of a Yellow Sun" by Chimamanda Ngozi Adichie
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.
