noun, plural UFO's, UFOs.
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Origin of UFO
Example sentences 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
Ryder recently disclosed that he had seen a giant UFO hovering 50 feet above him.
I must have done a double-take, like the Navy pilot who sees a UFO outside his cockpit.
Persons wishing to report UFO sightings should be advised to contact local law enforcement agencies.USAF Fact Sheet 95-03|United States Air Force
British Dictionary definitions for UFO
Cultural definitions for UFO (1 of 2)
An abbreviation for “Unidentified Flying Object.” Often described as “flying saucers,” some UFOs are believed to come from other planets or galaxies and thus support the idea that human beings are not the only form of intelligent life in the universe. Few scientists agree.
Cultural definitions for UFO (2 of 2)
The abbreviation for unidentified flying object. Sometimes referred to colloquially as “flying saucers.” Most UFO sightings have prosaic explanations; there is no hard evidence that extraterrestrial beings are visiting Earth.