rule

/ru:l/
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rule

A student uses a ruler to draw a straight line on a piece of paper.

Definition

  1. Noun:

    • A prescribed guide for conduct or action; a regulation or principle governing procedure or behavior: An established standard or law that must be followed.
    • The exercise of authority or control; dominion: The power to govern or command.
    • A customary or habitual course of action: A usual practice or habit.
    • A straight-edged strip for measuring or drawing straight lines: A tool used in geometry or drafting.

  2. Verb:

    • To exercise authority or power over; to govern or control: To have command over people or a territory.
    • To be prevalent or current: To be the standard or dominant condition.
    • To make a formal decision or judgment, especially in a legal context: To decide authoritatively.
    • To mark with lines using a ruler: To draw straight lines.
Usage Examples

  • Noun:

    • Follow the rules of the game. (Obey the established guidelines for playing.)
    • The country was under foreign rule for decades. (The nation was controlled by a foreign power.)
    • As a rule, she drinks tea in the morning. (It is her usual habit.)
    • Use a rule to draw a straight line. (Use a measuring tool.)

  • Verb:

    • A wise king should rule justly. (A wise king should govern with fairness.)
    • Chaos ruled in the streets after the storm. (Disorder was the prevailing condition.)
    • The judge will rule on the motion tomorrow. (The judge will make a legal decision.)
    • Rule the paper before you begin writing. (Draw lines on the paper.)
Advanced Usage

  • "Rule of thumb": A practical, experience-based method or principle that is not strictly precise.

    • As a rule of thumb, cook the rice for 18 minutes. (Use this general, practical guideline.)

  • "Rule out": To eliminate or exclude as a possibility.

    • The doctor ruled out an infection. (The doctor eliminated infection from consideration.)

  • "Rule the roost": To be in charge or in a position of authority.

    • Everyone knows who rules the roost in that office. (Everyone knows who is in charge.)
Variants and Related Words

  • Ruler (n): A person who governs; also, the measuring tool.

    • The ruler addressed the crowd. (The leader spoke.)
    • A 12-inch ruler. (A measuring stick.)

  • Ruling (n/adj): An official decision; currently in power.

    • The court's ruling was final. (The court's decision.)
    • The ruling party. (The political party currently in control.)
Synonyms
  • Noun: Regulation, law, principle, dominion, control, habit, custom.
  • Verb: Govern, control, reign, dominate, decide, decree.
Related Phrasal Verbs

  • Rule over: To have sovereignty or control over a place or people.

    • He ruled over a vast empire. (He governed a large empire.)

  • Rule against/in favor of: To make a judicial decision opposing or supporting something.

    • The court ruled against the company. (The court decided unfavorably for the company.)
Related Idioms

  • The exception proves the rule: The existence of an exception confirms that a general rule is valid.

    • He's usually late, so his being early today is the exception that proves the rule. (His punctuality today highlights his usual lateness.)

  • Rule with an iron fist/rod: To govern in a very strict and harsh manner.

    • The dictator ruled with an iron fist. (The dictator governed with severe control.)
rule

A student uses a ruler to draw a straight line on a piece of paper.

Noun
  1. measuring stick consisting of a strip of wood or metal or plastic with a straight edge that is used for drawing straight lines and measuring lengths
  2. (mathematics) a standard procedure for solving a class of mathematical problems
    • he determined the upper bound with Descartes' rule of signs
    • he gave us a general formula for attacking polynomials
  3. a rule or law concerning a natural phenomenon or the function of a complex system
    • the principle of the conservation of mass
    • the principle of jet propulsion
    • the right-hand rule for inductive fields
  4. any one of a systematic body of regulations defining the way of life of members of a religious order
    • the rule of St. Dominic
  5. directions that define the way a game or sport is to be conducted
    • he knew the rules of chess
  6. dominance or power through legal authority
    • France held undisputed dominion over vast areas of Africa
    • the rule of Caesar
  7. the duration of a monarch's or government's power
    • during the rule of Elizabeth
  8. a basic generalization that is accepted as true and that can be used as a basis for reasoning or conduct
    • their principles of composition characterized all their works
  9. (linguistics) a rule describing (or prescribing) a linguistic practice
  10. prescribed guide for conduct or action
  11. something regarded as a normative example
    • the convention of not naming the main character
    • violence is the rule not the exception
    • his formula for impressing visitors
  12. a principle or condition that customarily governs behavior
    • it was his rule to take a walk before breakfast
    • short haircuts were the regulation
Verb
  1. keep in check
    • rule one's temper
  2. mark or draw with a ruler
    • rule the margins
  3. have an affinity with; of signs of the zodiac
  4. decide on and make a declaration about
    • find someone guilty
  5. be larger in number, quantity, power, status or importance
    • Money reigns supreme here
    • Hispanics predominate in this neighborhood
  6. decide with authority
    • The King decreed that all firstborn males should be killed
  7. exercise authority over; as of nations
    • Who is governing the country now?

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