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ruler

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ruler/ˈruːlɚ/noun
pluralrulers
ruler
/ˈruːlɚ/
noun
pluralrulers
Learner's definition of RULER  
[count]
: a person (such as a king or queen) who rules a country, area, group, etc.
: a straight piece of plastic, wood, or metal that has marks on it to show units of length and that is used to measure things
— see picture at carpentry
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