noun, plural UFO's, UFOs.
Origin of UFO
Examples from the Web for ufo
At that point, a sphere lit up, resembling the landing of the UFO in E.T., and the overheard lights descended on the stage.I'm Not Country or Pop. I'm Just Pure Garth Brooks.|David Masciotra|September 10, 2014|DAILY BEAST
Long speculated to be a UFO research center, Burlington has been the subject of rampant conspiracies for decades.
There is a lot of elaborate make-up and costuming, and then a UFO arrives.Punks, UFOs, and Heroin: How ‘Liquid Sky’ Became a Cult Movie|Daniel Genis|June 2, 2014|DAILY BEAST
I must have done a double-take, like the Navy pilot who sees a UFO outside his cockpit.
Not even Dennis Kucinich, who has spoken of his own UFO encounter before, took the deal.Citizen Hearing on Disclosure, a Faux Hearing About Alien Encounters|Josh Dzieza|May 2, 2013|DAILY BEAST
1953, abbreviation of Unidentified Flying Object, which is attested from 1950.