ruler

From Wiktionary, the free dictionary

The Simple English Wikipedia has an article on:

Word parts

rule + -er

Pronunciation

Noun

Singular
ruler

Plural
rulers

  1. (countable) A ruler is a device used for measuring things.
    The ruler says that the shelf is 12 centimeters wide.
  2. (countable) If a person is a ruler, they are in charge.
    The king was a ruler of many people.

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