- An occurrence, circumstance, or fact that is perceptible by the senses.
- pl. -nons.
- An unusual, significant, or unaccountable fact or occurrence; a marvel.
- 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.
[Late Latin phaenomenon, from Greek phainomenon, from neuter present participle of phainesthai, to appear.]
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.



