Usually means: Operating system kernel for macOS.
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We found 5 dictionaries that define the word XNU:

General (2 matching dictionaries)
  1. XNU: Dictionary.com
  2. XNU, Xnu: Wikipedia, the Free Encyclopedia

Miscellaneous (3 matching dictionaries)
  1. XNU: Acronym Finder
  2. AbbreviationZ (No longer online)

Definitions from Wikipedia (XNU)

noun:  ("X is Not Unix") the computer operating system kernel developed at Apple Inc. since December 1996 for use in the Mac OS X (now macOS) operating system and released as free and open-source software as part of the Darwin OS, which, in addition to being the basis for macOS, is also the basis for Apple TV Software, iOS, iPadOS, watchOS, visionOS, and tvOS.


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