Definition of UFO noun from the Oxford Advanced American Dictionary

 

UFO

 noun
(also ufo)noun
NAmE//ˌyu ɛf ˈoʊ//
 
(pl. UFOs)
 
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the abbreviation forUnidentified Flying Object(a strange object that some people claim to have seen in the sky and believe is a spacecraft from another planet) compare flying saucer
See the Oxford Advanced Learner's Dictionary entry: UFO