Meaning of “ruler” in the English Dictionary

"ruler" in British English

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rulernoun [ C ]

uk /ˈruː.lər/ us /ˈruː.lɚ/

ruler noun [ C ] (LEADER)

C1 the leader of a country:

The country was without a ruler after the queen died.

ruler noun [ C ] (FOR DRAWING)

A2 old-fashioned or formal rule a long, narrow, flat piece of plastic, metal, or wood with straight edges where centimetres or inches, or both are printed. It is used for measuring things and for drawing straight lines.

(Definition of “ruler” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"ruler" in American English

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rulernoun [ C ]

us /ˈru·lər/

ruler noun [ C ] (MEASUREMENT)

a narrow, flat object with straight edges you can use to draw straight lines and having marks you can use to measure things

ruler noun [ C ] (CONTROL)

a person who is in charge of a country:

a military ruler

(Definition of “ruler” from the Cambridge Academic Content Dictionary © Cambridge University Press)