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Definition of UFO in English:

UFO

Pronunciation /ˌyo͞o ˌef ˈō/ /ˌju ˌɛf ˈoʊ/

nounUFOs

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

    flying saucer, foo fighter
    View synonyms

Origin

1950s acronym from unidentified flying object.

Pronunciation

UFO

/ˌyo͞o ˌef ˈō/ /ˌju ˌɛf ˈoʊ/