The definition of a phenomenon is something that is observable or an extraordinary thing or person.
(noun)See phenomenon in Webster's New World College Dictionary
noun pl. phenomena , phenomenons
Origin: LL phaenomenon < Gr phainomenon, neut. prp. of phainesthai, to appear, akin to phainein: see fantasy
See phenomenon in American Heritage Dictionary 4
noun pl. phe·nom·e·na (-nə)
Origin:
Origin: Late Latin phaenomenon
Origin: , from Greek phainomenon
Origin: , from neuter present participle of phainesthai, to appear; see bhā-1 in Indo-European roots
. 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.Learn more about phenomenon