Limit
From Wikinfo
A Limit is a basic process which both in nature and in designed processes sets the bounds of a phenomenon or indeed anything.
In mathematics limit has a specialized definition, see Mathematical limit
Albert Camus wrote about the philosophical concept of limit especially as it plays out in politics.
All phenomena found in nature (you must realize that artificial phenomena are also found in nature) have limits within which they can exist. A simple example is an ice cube.
