Definition of 404 in English:

404

Syllabification: 404

noun

Computing
  • 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.

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Word of the day kerf
Pronunciation: kərf
noun
a slit made by cutting with a saw