Definition of UFO in English:

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UFO

Pronunciation: /juːɛfˈəʊ/
/ˈjuːfəʊ/

noun (plural UFOs)

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.

Origin

1950s: acronym from unidentified flying object.

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