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English definition of “UFO”

UFO

noun [C] uk   /ˌjuː.efˈəʊ/ us    /-ˈoʊ/
abbreviation for unidentified flying object: an object seen in the sky that is thought to be a spacecraft from another planet: Several UFO sightings have been reported.
(Definition of UFO from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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