Phenomenon

Observable event or occurrence.

phenomena event

A phenomenon is an observable event or occurrence that can be studied and analyzed through observation, measurement, or experimentation.

/fɪˈnɒmən̩/

From Ancient Greek phainómenon, from phainein 'to appear'.

A phenomenon is just a fancy word for something you can see or experience happening, like rain falling or a rainbow appearing.

The word 'phenomenon' comes from the Greek word 'phainómenon', meaning 'that which appears'
Many optical illusions are considered visual phenomena
Some psychological effects, like the placebo effect, are also considered phenomena

event occurrence

miracle illusion effect

event-based natural social