Question

define phenomena..
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Answer 1

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A phenomenon is "an observable fact or event." The term came into its modern philosophical usage through Immanuel Kant, who contrasted it with the noumenon, which cannot be directly observed. 

Answer 2

Answer:

The definition of a phenomenon is something that is observable or an extraordinary thing or person. An example of phenomenon is a lunar eclipse. An example of phenomenon is a classical musical great such as Beethoven. An occurrence, circumstance, or fact that is perceptible by the senses.

In medical terms

phenomena , A symptom; an occurrence of any sort, whether ordinary or extraordinary, in relation to a disease.