Causality (noun)

1. The relationship between a cause and its effect.
2. The principle that every event or state of affairs, especially a significant event or a state of affairs in human affairs, must have a cause.

Origin:

Late middle english: from latin causalitas, from causa "cause".

Examples:

1. The causality between smoking and lung cancer is well established.
2. The study of causality is central to the development of scientific theories.
3. The causality between poverty and crime is complex and often debated.
4. Causality is a fundamental concept in physics and philosophy.
5. The causality of the accident is still under investigation.