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
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
Princess Mako, a niece of Japan's Emperor Naruhito (and whose younger brother is the likely next ruler of Japan), married her longtime love, Kei Komuro, in a simple ceremony at a registry office on Oct. 26, 2021.
—
Alex Apatoff, People.com, 15 July 2025
In 2019, during the first Trump administration, the State Department invoked a similar authority under the budget act to impose visa sanctions on Raúl Castro, the island's ultimate ruler, and his sons and daughters.
—arkansasonline.com, 13 July 2025
Evanescence earns its first ruler on the survey, which began in 2009.
—Kevin Rutherford, Billboard, 11 July 2025
Rebirth surges despite its B audience grade and holds well enough to still be the undisputed ruler of summer movie box office season.
—Mark Hughes, Forbes.com, 9 July 2025
See All Example Sentences for ruler
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Alex Apatoff, People.com, 15 July 2025
In 2019, during the first Trump administration, the State Department invoked a similar authority under the budget act to impose visa sanctions on Raúl Castro, the island's ultimate ruler, and his sons and daughters.
—arkansasonline.com, 13 July 2025
Evanescence earns its first ruler on the survey, which began in 2009.
—Kevin Rutherford, Billboard, 11 July 2025
Rebirth surges despite its B audience grade and holds well enough to still be the undisputed ruler of summer movie box office season.
—Mark Hughes, Forbes.com, 9 July 2025
See All Example Sentences for ruler
Cite this Entry
“Ruler.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ruler. Accessed 19 Jul. 2025.
Copy CitationKids Definition
ruler
noun
rul·er
ˈrü-lər 
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
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