rulerPronunciation: /ˈruːlə/Translate ruler | into French | into German | into Italian | into Spanish Definition of ruler noun 1a person exercising government or dominion. Astrologyanother term for ruling planet. 2a straight strip or cylinder of plastic, wood, metal, or other rigid material, typically marked at regular intervals and used to draw straight lines or measure distances. Derivatives rulership noun ruler in other Oxford dictionaries Definition of ruler in the US English dictionary
