Rule

rule

1. the exercise of governmental authority or control

2. the period of time in which a monarch or government has power

3. a prescribed method or procedure for solving a mathematical problem, or one constituting part of a computer program, usually expressed in an appropriate formalism

4. any of various devices with a straight edge for guiding or measuring; ruler

5. Christianity a systematic body of prescriptions defining the way of life to be followed by members of a religious order

6. Law an order by a court or judge

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rule [rül]

(mathematics)

An antecedent condition and a consequent proposition that can support deductive processes.

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Rule [′rül]

(astronomy)

Norma

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rule

common types of rules

An instrument having straight edges, usually marked off in inches or centimeters and fractions thereof; used for measuring distance and for drawing straight lines.

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Rule 

a proposition that expresses permission or a requirement to perform or refrain from performing, under particular conditions, some act; the word “act” is understood to refer to some action or absence of action. These rules are called rules of permission and obligation, respectively; they are considered in a natural way to be elementary, or rules of the first rank, and are subsumed under the general term “injunction.” Complex rules are rules of the (n+ 1)th rank, obtained by applying injunctions to collections of rules of the nth or lesser rank in such a way that at least one of these rules must be of the nth rank. Ordinary grammatical rules are examples of rules of different, but not very high, ranks. A method is a system of rules of different ranks that includes rules designating the order in which other rules of the same system are introduced and rearranged.

Rules, whose systematic study is the object of deontic (normative) logic, are of importance in daily life and in all branches of science, particularly mathematics, logic, linguistics, ethics, jurisprudence, sociology, and political economy.