ruler

noun

rul·​er ˈrü-lər 

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

ˈrü-lər-ˌship 

noun

Synonyms

• autocrat
• monarch
• potentate
• sovereign
• sovran

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

The 3,000 artifacts include figurines, tusks, likeness of Benin’s rulers, and sacred masks, the bulk of which now reside with state museums in Europe. —Tessa Solomon, ARTnews.com, 18 July 2024

For instance, do straight-edge rulers on opposite sides of the device – one in millimeters and one in inches – really count as two tools? —Ben Coxworth, New Atlas, 16 July 2024

The representatives of action and fortune disagree with your sign ruler, Saturn. —Jennifer Culp, Them, 15 July 2024

Mars is conjunct your modern ruler, Uranus, bringing unexpected shake-ups and upheaval to your fourth house of home, family and emotional foundations. —Valerie Mesa, Peoplemag, 8 July 2024

Word History

First Known Use

14th century, in the meaning defined at sense 1

Phrases Containing ruler

• co-ruler

Kids Definition

ruler

noun

rul·​er ˈrü-lər 

1

: sovereign entry 1 sense 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