noun
EXAMPLES FROM CORPUS
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Coastguards, police and the Lerwick Observatory received 17 independent reports of a UFO .
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Holloman was the supposed site of a famous UFO encounter, the one that Close Encounters was based on.
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Is this an encounter with a UFO ?
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Jason says UFO is his favourite night of the week.
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Teacher, that is a UFO ?
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The genuine effects are reproducible; the quirky - such as UFO sightings - are filed away but rarely prove significant for science.
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They had chosen to sign up with the UFO subculture.