ruler Meaning in the Cambridge English Dictionary
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Meaning of “ruler” in the English Dictionary

"ruler" in British English

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rulernoun [C]

uk   /ˈruː.lər/  us   /-lɚ/

ruler noun [C] (LEADER)

C1 the ​leader of a ​country: The ​country was without a ruler after the ​queendied.

ruler noun [C] (FOR DRAWING)

A2 (old-fashioned or formal rule) a ​long, ​narrow, ​flatpiece of ​plastic, ​metal, or ​wood with ​straightedges where ​centimetres or inches, or both are ​printed. It is used for ​measuring things and for ​drawingstraightlines.
(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, ​flatobject with ​straightedges you can use to ​drawstraightlines 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)
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