Definition of UFO noun from the Oxford Advanced Learner's Dictionary



(also ufo) noun
BrE BrE//ˌjuː ef ˈəʊ//
; NAmE NAmE//ˌjuː ef ˈoʊ//
; BrE BrE//ˈjuːfəʊ//
; NAmE NAmE//ˈjuːfoʊ//
(pl. UFOs, ufos)
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the abbreviation for Unidentified 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 Word Origin1950s: acronym from unidentified flying object.
See the Oxford Advanced American Dictionary entry: UFO