UFO

[ yoo-ef-oh or, sometimes, yoo-foh ]

/ ˈyuˈɛfˈoʊ or, sometimes, ˈyu foʊ /

SEE SYNONYMS FOR UFO ON THESAURUS.COM

noun, plural UFO's, UFOs.

any unexplained moving object observed in the sky, especially one assumed by some observers to be of extraterrestrial origin.

Also called unidentified flying object.

Compare flying saucer.

Origin of UFO

1950–55; u(nidentified)f(lying)o(bject)

Words nearby UFO

uey, Ufa, U.F.C., Uffizi, Uffizi Gallery, UFO, ufology, UFT, UFW, ug, ugali

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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.
Britain’s Nuke-Proof Underground City|Nina Strochlic|June 26, 2014|DAILY BEAST
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.
A History of American Fun|Stefan Beck|February 9, 2014|DAILY BEAST

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

British Dictionary definitions for UFO

UFO

/ (sometimes ˈjuːfəʊ) /

abbreviation for

unidentified flying object

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Cultural definitions for UFO (1 of 2)

UFO

[ (yooh-ef-oh) ]

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)

UFO