What is the meaning of the word "law"?

Definitions:

a generalization that describes recurring facts or events in nature noun
- the laws of thermodynamics
legal document setting forth rules governing a particular kind of activity noun
- there is a law against kidnapping
the collection of rules imposed by authority noun
- civilization presupposes respect for the law
the force of policemen and officers noun
- the law came looking for him
the learned profession that is mastered by graduate study in a law school and that is responsible for the judicial system noun
- I studied law at Yale.