1. Concerning something that has been created by the earth or world, and not produced by humans: Earthquakes are considered to be natural catastrophes.
2. Pertaining to the circumstances environing a person or something: Mosquitoes have a natural enemy and that is the dragonfly!
3. Regarding a quality or ability which is innate in an individual; inborn: Mary had the natural talent of becoming a wonderful singer!
4. In music, a note that is neither sharped nor flatted: The natural sign was placed in front of the printed musical notation in Jane's piano music indicating that the tone was not to be raised or lowered.