from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An unidentified flying object.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • unidentified flying object
  • n. An unidentified flying object.
  • n. An alien spacecraft.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an (apparently) flying object whose nature is unknown; especially those considered to have extraterrestrial origins


Sorry, no etymologies found.


  • MC: The name UFO Geek came from my youngest sister.

    Alexandra Holzer: Mike Coletta: A True UFO Geek (VIDEO)

  • So let me explain: the term UFO is not synonymous with an extraterrestrial or interdimensional spacecraft.

    UFO's aren't Science Fiction

  • Edward U. Condon in “Section I, Recommendations and Conclusions,” wrote, “The history of the past 21 years has repeatedly led Air Force officers to the conclusion that none of the things seen, or thought to have been seen, which pass by the name UFO reports, constituted any hazard or threat to national security.”

    Space Ships of the Visitors

  • We kept seeing the English word UFO popping up on this database as well and people wanted to know does the president know something he wasn't letting on, like this one, does the FBI have an "X" file?

    CNN Transcript Nov 16, 2009

  • • I've been on what I call my UFO Tour, which means, like UFOs, I too have been appearing in small southern towns in front of a handful of hillbillies lately. - Telegraph online, Daily Telegraph and Sunday Telegraph

  • People remember the cool vehicles in "UFO", but don't really ponder the storylines anymore.

    Happy endings or sad endings?

  • Their earnest and yet playful experiments accounted for the sudden and dramatic upsurge in "UFO" reports that more or less defined the 50's culture in a very real way.

    Happy Birthday, Ray Charles!

  • Andrews 'statement in _Extra-Terrestrials Among US_ that English went into a psychiatric hospital as a result of visiting a B-52 that had been attacked by a UFO is not true.

    Bill English

  • The richest guy I know believes in UFO's and he was nice enough to let me work on his space station project for a while.

    Governments Suppress Alien Truth - Former NASA Astronaut Edgar Mitchell - NASA Watch

  • A feature film based on the 1970s British TV series UFO is in the works.

    May 2009


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