phenomenon

noun
phe*nom*e*non \ fi-ˈnä-mə-ˌnän \ -nən \
1583{ds||1||}
  • an observable fact or event
  • an object or aspect known through the senses rather than by thought or intuition
  • a temporal or spatiotemporal object of sensory experience as distinguished from a noumenon

phi phenomenon

noun
phi phenomenon \
circa 1928
  • apparent motion resulting from an orderly sequence of stimuli (such as lights flashed in rapid succession a short distance apart on a sign) without any actual motion being presented to the eye

unidentified aerial phenomenon

noun
unidentified aerial phenomenon \
1949
  • a mysterious flying object in the sky that is sometimes assumed to be a spaceship from another planet : UAP —used especially as an alternative to UFO or unidentified flying object

unidentified anomalous phenomenon

noun
unidentified anomalous phenomenon \
2020
  • a mysterious phenomenon (especially an unidentified aerial phenomenon) that is sometimes assumed to be a spaceship from another planet : UAP —used especially as an alternative to UFO or unidentified flying object
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