UFO

[ yoo-ef-ohor, sometimes, yoo-foh ]

abbreviation for

, plural UFO's, UFOs.

1. unidentified flying object: any unexplained moving object observed in the sky, especially one assumed by some observers to be of extraterrestrial origin. Compare UAP ( def ), flying saucer ( def ).

UFO

/ ˈjuːfəʊ /

abbreviation for

1. unidentified flying object

UFO

¹

1. The abbreviation for u nidentified f lying o bject. Sometimes referred to colloquially as “flying saucers.” Most UFO sightings have prosaic explanations; there is no hard evidence that extraterrestrial beings are visiting Earth .

UFO

²

1. An abbreviation for “ U nidentified F lying O bject.” 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.

Usage Note

See UAP.

Word History and Origins

Origin of UFO¹

First recorded 1950–55

Example Sentences

At that point, a sphere lit up, resembling the landing of the UFO in E.T., and the overheard lights descended on the stage.

From The Daily Beast

Long speculated to be a UFO research center, Burlington has been the subject of rampant conspiracies for decades.

From The Daily Beast

There is a lot of elaborate make-up and costuming, and then a UFO arrives.

From The Daily Beast

Ryder recently disclosed that he had seen a  giant UFO hovering 50 feet above him.

From The Daily Beast

I must have done a double-take, like the Navy pilot who sees a UFO outside his cockpit.

From The Daily Beast

Persons wishing to report UFO sightings should be advised to contact local law enforcement agencies.

From Project Gutenberg