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natural

 
/ˈnætʃ·ər·əl/ adj (NOT ARTIFICIAL)

Definition

from nature; not artificial or involving anything made or caused by people: Cotton is a natural fiber. He died of natural causes (= because he was old or ill). Floods and earthquakes are natural disasters. If food or drink is described as natural, it means it has no artificial chemical substances added to it.
(Definition of natural adj (NOT ARTIFICIAL) from the Cambridge Academic Content Dictionary © Cambridge University Press)

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