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UFO

noun [C]
 
 
/ˌjuː.efˈəʊ/ US  /-ˈoʊ/

Definition

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.Space travel
(Definition of UFO noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of UFO