Meaning of “ruler” in the English Dictionary

"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)