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[roo-ler] /ˈru lər/
a person who rules or governs; sovereign.
Also, rule. a strip of wood, metal, or other material having a straight edge and usually marked off in inches or centimeters, used for drawing lines, measuring, etc.
a person or thing that rules paper, wood, etc.
Astrology. the planet primarily associated with any sign of the zodiac or any house of the horoscope:
The ruler of Aries is Mars. The ruler of Taurus is Venus.
Origin of ruler
1325-75; Middle English; see rule, -er1
Related forms
subruler, noun
underruler, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for ruler
Contemporary Examples
Historical Examples
  • No other ruler was provided with so well-filled a treasury, or so disciplined an army.

    The Thirty Years' War Samuel Rawson Gardiner
  • And do you know that your ruler, Ozma of Oz, has been stolen?

    The Lost Princess of Oz L. Frank Baum
  • For this he was no longer permitted to be a ruler of the Jews.

    A Life of St. John for the Young George Ludington Weed
  • I was not aware that I had a ruler, so of course I couldn't know that she was stolen.

    The Lost Princess of Oz L. Frank Baum
  • "Then the government which reigns over several planets is supreme," the ruler said.

    Lost in Translation Larry M. Harris
British Dictionary definitions for ruler


a person who rules or commands
Also called rule. a strip of wood, metal, or other material, having straight edges graduated usually in millimetres or inches, used for measuring and drawing straight lines
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for ruler

"one who rules," late 14c., agent noun from rule (v.). Meaning "instrument used for making straight lines" is c.1400 (cf. rule (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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