ruler

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Concise Oxford English Dictionary © 2008 Oxford University Press:
ruler/ˈruːlə(r)/
noun
  • 1 a person or agent exercising government or control.
  • 2 a straight-edged strip of rigid material, marked at regular intervals and used to draw straight lines or measure distances.
– derivatives
rulership noun.
'ruler' also found in these Oxford entries:

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