Definition of phenomenon
1
plural phenomena
: an observable fact or event
2
plural phenomena
a
: an object or aspect known through the senses rather than by thought or intuition
b
: a temporal or spatiotemporal object of sensory experience as distinguished from a noumenon
c
: a fact or event of scientific interest susceptible to scientific description and explanation
3a
: a rare or significant fact or event
b
plural phenomenons
: an exceptional, unusual, or abnormal person, thing, or occurrence
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Merriam-Webster unabridged
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Time Traveler for phenomenon
The first known use of phenomenon was in 1605
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