ruler

rul|er /r'uːlər/ (rulers)
1 [N-COUNT] oft with poss
The ruler of a country is the person who rules the country.
...the former military ruler of Lesotho...
2 [N-COUNT]
A ruler is a long flat piece of wood, metal, or plastic with straight edges marked in centimetres or inches. Rulers are used to measure things and to draw straight lines.

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