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UFO
UFO [ y ef , y f ] (plural UFOs)


noun 
Definition:
 
unidentified flying object: a flying object that cannot be identified and is thought by some to be an alien spacecraft
[Mid-20th century. Acronym < unidentified flying object]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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