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Definition of ruler noun from the Oxford Advanced Learner's Dictionary

ruler

noun
 
/ˈruːlə(r)/
 
/ˈruːlər/
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  1. a person who rules or governs
    • He eventually became ruler over all Egypt.
    Extra Examples
    • At that time the East India Company was the virtual ruler of Bengal.
    • The country was finally united under one ruler.
    • a ruler who held power for over twenty years
    • an absolute ruler who will tolerate no opposition
    • He established himself as ruler over both tribes.
    • There was a successful coup against the country's military rulers.
    • Vietnam still had strong links with France, the former colonial ruler.
    Topics Politicsb1
    Oxford Collocations Dictionaryadjective
    • great
    • effective
    • good
    preposition
    • under a/​the ruler
    • ruler over
    See full entry
  2. a straight narrow piece of wood, plastic or metal, marked in centimetres or inches, used for measuring or for drawing straight linesTopics Maths and measurementa2, Educationa2
See ruler in the Oxford Advanced American DictionarySee ruler in the Oxford Learner's Dictionary of Academic English

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