[ roo-ler ]
See synonyms for: rulerrulers on

  1. a person who rules or governs; sovereign.

  2. 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.

  1. a person or thing that rules paper, wood, etc.

  2. 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

Middle English word dating back to 1325–75; see origin at rule, -er1

Other words from ruler

  • sub·rul·er, noun
  • un·der·rul·er, noun

Words Nearby ruler Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use ruler in a sentence

British Dictionary definitions for ruler


/ (ˈruːlə) /

  1. a person who rules or commands

  2. 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