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Definition of ruler:

  1. A straight or curved strip of wood, metal, etc., with a smooth edge, used for guiding a pen or pencil in drawing lines. Cf. Rule, n., 7 ( a).
  2. One who rules; one who exercises sway or authority; a governor.

Synonyms:

pattern, sovereign, convention, linguistic rule, prime minister, adjudicator, crowned head, principle, monarch, rule, potentate, normal, chancellor, prescript, dominion, dictator, chief executive, emperor, head of state, premier, director for types of rules, regulation, prince, formula, swayer, regent.

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