ruler - definition and synonyms

noun [countable] 

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  1. 1
    an object used for measuring or for drawing straight lines, consisting of a long flat piece of plastic, wood, or metal marked with units of measurement
    1. a.
      computing a part of a computer screen used for showing the distance of something from the side or top of the screen
  2. 2
    someone who controls a country

    Haiti’s former military rulers

    He had more power than any ruler of Spain until Franco.