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English definition of “ruler”

ruler

noun [C] uk   /ˈruː.lər/ us    /-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 Learners Dictionary & Thesaurus © Cambridge University Press)
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