any event, circumstance, or experience that is apparent to the senses and that can be scientifically described or appraised, as an eclipse
in Kantian philosophy, a thing as it appears in perception as distinguished from the thing as it is in itself independent of sense experience
any extremely unusual or extraordinary thing or occurrence
Informal a person with an extraordinary quality, aptitude, etc.; prodigy
See phenomenon in American Heritage Dictionary 4
(fĭ-nŏmˈə-nŏnˌ, -nən)
nounpl.phe·nom·e·na(-nə)
An occurrence, circumstance, or fact that is perceptible by the senses.
pl.phe·nom·e·nons
a. An unusual, significant, or unaccountable fact or occurrence; a marvel.
b. A remarkable or outstanding person; a paragon. See Synonyms at wonder.
Philosophy In the philosophy of Kant, an object as it is perceived by the senses, as opposed to a noumenon.
Physics An observable event.
Usage Note: Phenomenon is the only singular form of this noun; phenomena is the usual plural. Phenomenons may also be used as the plural in nonscientific writing when the meaning is “extraordinary things, occurrences, or persons”: They were phenomenons in the history of music.