ruler

noun

rul·​er ˈrü-lər How to pronounce ruler (audio)
1
: one that rules
specifically : sovereign
2
: a worker or a machine that rules paper
3
: a smooth-edged strip (as of wood or metal) that is usually marked off in units (such as inches) and is used as a straightedge or for measuring
rulership noun

Examples of ruler in a Sentence

a summit attended by a number of rulers from around the world This ruler shows inches and centimeters.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The ultimate ruler on the appeal of the board’s decision is the board. Mercury News Editorial, Mercury News, 27 June 2025 But today’s escalating tensions go back to 1953, when British oil companies and the CIA orchestrated a coup and installed the Shah of Iran, a secular ruler willing to accommodate Big Oil and other corporate interests in the West. Robert Polner, New York Daily News, 23 June 2025 Art and creativity flourished under her rule, with the Deir el-Bahri complex built during her time as ruler. Rachael O'Connor, MSNBC Newsweek, 23 June 2025 Germany's Chancellor Friedrich Merz also discussed the Israel-Iran conflict with Qatar's ruler ahead of the Geneva talks. Arkansas Online, 20 June 2025 See All Example Sentences for ruler

Word History

First Known Use

14th century, in the meaning defined at sense 1

Time Traveler
The first known use of ruler was in the 14th century

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Cite this Entry

“Ruler.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ruler. Accessed 7 Jul. 2025.

Kids Definition

ruler

noun
rul·​er ˈrü-lər How to pronounce ruler (audio)
1
2
: a straight strip of material (as wood or metal) marked off in units and used as a guide in drawing lines or for measuring

More from Merriam-Webster on ruler

Last Updated: - Updated example sentences
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