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Definition of UFO in English:

UFO

Pronunciation /juːɛfˈəʊ/ /ˈjuːfəʊ/

nounUFOs

  • A mysterious object seen in the sky for which it is claimed no orthodox scientific explanation can be found, often supposed to be a vehicle carrying extraterrestrials.

    flying saucer, foo fighter
    View synonyms

Origin

1950s acronym from unidentified flying object.

Pronunciation

UFO

/juːɛfˈəʊ/ /ˈjuːfəʊ/