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Definition of UFO in English:

UFO

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nounplural noun UFOs

  • A mysterious object seen in the sky for which, it is claimed, no orthodox scientific explanation can be found.

    flying saucer, foo fighter
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Pronunciation

UFO

/ˌyo͞oˌefˈō/ /ˌjuˌɛfˈoʊ/ /ˈyo͞oˌfō/ /ˈjuˌfoʊ/

Origin

1950s acronym from unidentified flying object.