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The Simple English Wikipedia has an article on:

Singular
superpower

Plural
superpowers

  1. (countable) A superpower is a very strong country.
    The United States and the Soviet Union were the superpowers of the last century.
  2. (countable) A superpower is something a superhero can do that a real person could not do.
    His superpowers included being able to fly and the through lightning.
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