Oxford Dictionary English

UFO

noun
(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 Oxford Collocations DictionaryUFO is used before these nouns: sighting See full entry Word Origin1950s: acronym from unidentified flying object.
See UFO in the Oxford Advanced American Dictionary
Check pronunciation: UFO
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