Definition of UFO in English:

UFO

Pronunciation /juːɛfˈəʊ//ˈjuːfəʊ/

noun

  • 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/