An error message displayed by a browser indicating that an Internet address cannot be found.
More example sentences
- Let's solve this, or at least be friendly to your users and help them get back on track whenever they hit a 404.
- We've been checking the contents of the URLs over the weekend:they were all showing 404 until last night, when two of the URLs become active.
Definition of 404 in:
- The British & World English dictionary