He died of 'natural causes'. [=he died because he was ill or old and not by being killed in an accident, battle, etc.]
She was adopted immediately after she was born and never knew her 'natural' [=(more commonly) 'birth'] parents.
a country rich in 'natural resources' [=a country that has many valuable plants, animals, minerals, etc.]
(..) The group was looking for a street kid. Someone real but also... Pretty enough to turn the head of a hong kong paymaster. He was a natural from the start. I believe it. Couple years later, I sponsored him for training. Youngest guy ever. (..)2015 TvShow: Homeland Title: A False Glimmer Season: 5 Episode 12