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English Lexicon

Ufo

/ˈjuː.foʊ/
nounCEFR B2 (Upper)Top #4500 frequency
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Comprehensive Definitions & Senses

2 senses
As noun
  1. 1

    An unidentified flying object; a mysterious flying craft or phenomenon in the sky that cannot be immediately explained by science.

    "Several witnesses reported seeing a strange, glowing UFO hovering above the mountains."
  2. 2

    A spacecraft allegedly belonging to extraterrestrial beings.

    "The documentary explores the history of alleged UFO sightings and alien encounters."
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Linguistic Origin & Historical Etymology

Derived as an acronym from the English expression 'unidentified flying object', coined by the United States Air Force in 1953 to replace older terms like 'flying saucer'. The term quickly entered popular culture and was adopted into various languages, including Portuguese as 'OVNI' (Objeto Voador Não Identificado).

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