a fact, occurrence, or circumstance observed or observable

to study the phenomena of nature.

something that is impressive or extraordinary.

a remarkable or exceptional person; prodigy; wonder.

Philosophy .

an appearance or immediate object of awareness in experience.

Kantianism . a thing as it appears to and is constructed by the mind, as distinguished from a noumenon, or thing-in-itself.

noun

normality , regularity

noun

abnormality , actuality , anomaly , appearance , aspect , circumstance , curiosity , episode , event , exception , experience , fact , happening , incident , marvel , miracle , nonpareil , one for the books , paradox , peculiarity , portent , prodigy , rara avis , rarity , reality , sensation , sight , something else , spectacle , stunner , uniqueness , astonishment , wonder , wonderment