Rule

Rule has several meanings:

A rule in mathematics is something which is always true.
Law and morality may be seen as sets of rules (or norms). See also normative ethics and philosophy of law.
A rule may also be used a straightedge and for measurement.
Rule of thumb is a suggestion which is usually a good idea.
To rule a country is to control the country.
In the field of artificial intelligence, a database of rules can be used to govern the behavior of a system.

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Categories: Disambiguation