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English definition of “phenomenon”

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phenomenon

noun  /fɪˈnɑm·əˌnɑn, -nən/ us  

phenomenon noun (EXPERIENCE)

[C] ( plural phenomena  /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.

phenomenon noun (SPECIAL PERSON/THING)

[C usually sing] ( plural phenomenons) 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)
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