What is the meaning of the word "natural"?

Definitions:

(of a musical note) being neither raised nor lowered by one chromatic semitone adjective
- a natural scale
(used especially of commodities) being unprocessed or manufactured using only simple or minimal processes adjective
- natural yogurt
being talented through inherited qualities adjective
- a natural leader
existing in or in conformity with nature or the observable world adjective
- neither supernatural nor magical
someone regarded as certain to succeed noun
- he's a natural for the job