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From Wikipedia, the free encyclopedia

Rule, ruler, or ruling usually refers to standards for activities.

Rule, ruler, or ruling may refer to:


Guides for human activity

  • Rule of thumb, a principle with broad application that is not intended to be strictly accurate or reliable for every situation
  • Moral, a rule or element of a moral code for guiding choices in human behavior
  • Norm (sociology), an informal but widely accepted rule, concept, truth, definition, or qualification (social norms, legal norms, coding norms)
  • Norm (philosophy), a kind of sentence or a reason to act, feel or believe
  • Regulation of sport, rules for a sport

Law and government

  • Ruler, see monarch, the person who rules a country
  • Procedural law, a ruleset governing the application of laws to cases
    • A law, which may informally be called a "rule"
    • A court ruling, a decision by a court
  • In the Federal government of the United States, a regulation mandated by Congress, but written or expanded upon by the Executive Branch
  • Governance:
    • Military rule, governance by a military body
    • Monastic rule, a collection of precepts that guides the life of monks or nuns in a religious order where the superior holds the place of Christ

Science and technology

  • Technical rules, see standardization, the process of developing and agreeing upon technical standards
  • Ruler, a straight edge instrument that may also be used to measure distances
  • Rule, a component of an astrolabe, circumferator or similar instrument
  • Slide rule, an obsolete instrument for calculation
  • Mathematics and logic


  • Rewrite rule, rules for replacing one item by another
  • Production rule, a set of rules about behavior or forming something
  • Heuristic, a quantized "rule" which shows a tendency or probability for producing a desired function
  • RULE Project (Run Up-to-date Linux Everywhere), a project that aims to use up-to-date Linux software on old PCs
  • Rule engine, a software system that helps managing business rules

Television, film, music, and books

Other uses


Up to date as of January 15, 2010
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Definition from Wiktionary, a free dictionary



Wikipedia has articles on:







rule (plural rules)

  1. A regulation, law, guideline.
  2. A ruler; device for measuring, a straightedge, a measure.
  3. Something to keep order.

Derived terms

Related terms



to rule

Third person singular

Simple past

Past participle

Present participle

to rule (third-person singular simple present rules, present participle ruling, simple past and past participle ruled)

  1. To regulate, be in charge of, make decisions for, reign over.
  2. (slang, intransitive) To excel.
    This game rules!


Derived terms

External links

  • rule in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
  • rule in The Century Dictionary, The Century Co., New York, 1911


  • Anagrams of elru
  • lure

Simple English

Simple English Wiktionary has the word meaning for:

When something always does the same thing, one can say that there is a rule that it does what it does.

The word "rule" has many uses, including the following:

A means of measurement (such as a slide rule.)
A law or regulation.
A precedent or conclusion drawn from experiments.

A "rule" in mathematics is a formula which allows a person to work out a sum if he or she has certain information. For example, Pythagoras' theorem is a rule which states that if a person knows the lengths of two sides of a right-angled triangle he or she can work out the length of the third.

Rules, however, can also means laws created by people in power - for example, school rules are the "laws" of a specific school.

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