noun rul·er \ˈrü-lər\

: a person (such as a king or queen) who rules a country, area, group, etc.

: a straight piece of plastic, wood, or metal that has marks on it to show units of length and that is used to measure things

Full Definition of RULER

:  one that rules; specifically :  sovereign
:  a worker or a machine that rules paper
:  a smooth-edged strip (as of wood or metal) that is usually marked off in units (as inches) and is used as a straightedge or for measuring
rul·er·ship \-ˌship\ noun

Examples of RULER

  1. a summit attended by a number of rulers from around the world
  2. This ruler shows inches and centimeters.

First Known Use of RULER

14th century
RULERSHIP Defined for Kids


noun rul·er \ˈrü-lər\

Definition of RULER for Kids

:  a person (as a king or queen) having supreme power over a nation
:  a straight strip (as of plastic, wood, or metal) with a smooth edge that is marked off in units and used for measuring or as a guide in drawing straight lines


Next Word in the Dictionary: rules committeePrevious Word in the Dictionary: rule outAll Words Near: ruler
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears