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What does A51 stand for?

A51 stands for Area 51

This definition appears very frequently and is found in the following Acronym Finder categories:

  • Organizations, NGOs, schools, universities, etc.
  • Slang/chat, popular culture
  • Business, finance, etc.

Samples in periodicals archive:

The bulk of Area 51 (Little, Brown) is plausible and well sourced, but one element of the story is not.
Area 51 Annie Jacobsen Little, Brown c/o Hachette Book Group 237 Park Avenue, New York, NY 10017 9780316132947, $27.
The video, Area 51 - Alien Interview, shows the bug-eyed "alien" in apparent distress as a heart monitor spirals out of control.