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.]
(..) of outrageous fortune "or to take arms against a sea of trouble, "And by sleep to say we end the heartache "and the thousand natural shocks that flesh is heir to. "the undiscovered country... from whose bourn"... "In thy orisons, be all my sins remembered... (..)2016 TvShow: 12 Monkeys Title: Lullaby Season: 2 Episode 8