Area 51 (noun) Definition, Meaning & Examples

noun Informal.
  1. a highly classified U.S. Air Force facility in southern Nevada. Area 51 has been the subject of speculation that the site is used to study and conceal evidence of UFO activity as well as visitations by extraterrestrials: Just when I’m sure that all this UFO talk about Area 51 is plain nonsense, someone comes out with a new book or documentary to make me start wondering again.
Area 51 (noun) Definition, Meaning & Examples

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