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.]
(..) Oh. Come in. I heard what happened. Oh, not to worry. Men brawl from time to time. It's only natural. Figured you were hungry. Oh, you're a good lad. Wanted to ask you something if you've got the time. (..)2015 TvShow: Game of Thrones Title: Hardhome Season: 5 Episode 8