What is the meaning of the word "rule"?

Definitions:

a principle or condition that customarily governs behavior noun
- It was their rule to take a walk before breakfast.
a standard procedure for solving a class of mathematical problems noun
- The student determined the upper bound with Descartes' rule of signs.
any one of a systematic body of regulations defining the way of life of members of a religious order noun
- the rule of St. Dominic
directions that define the way a game or sport is to be conducted noun
- I know the rules of chess.
keep in check verb
- rule one's temper
mark or draw with a ruler verb
- rule the margins
the duration of a monarch's or government's power noun
- during the rule of Elizabeth