plural phenomena : an observable fact or event 2 : a fact, feature, or event of scientific interest 3 a : a rare or important fact or event b plural phenomenons : an exceptional, unusual, or abnormal person or thing

[ C ] plural phenomena us / fɪˈnɑm·ə·nə / anything that is or can be experienced or felt, esp. something that is noticed because it is unusual or new: We discussed the ever-growing popularity of talk radio, and wondered how to explain this phenomenon.

[count] 1 plural phenomena /-ənə/ /fɪ ˈnɑːmənə/ : something (such as an interesting fact or event) that can be observed and studied and that typically is unusual or difficult to understand or explain fully natural phenomena like lightning and earthquakes

phenomenon /fɪˈnɒmɪnən/ n (pl -ena / -ɪnə /, -enons) anything that can be perceived as an occurrence or fact by the senses any remarkable occurrence or person the object of perception, experience, etc

someone or something special, esp. because it is completely different or extremely unusual: He was a kind of phenomenon, an actor running for president. (Definition of phenomenon from the Cambridge Academic Content Dictionary © Cambridge University Press)