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planet

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noun planet pronunciation in British English /ˈplænɪt/ 
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singularplanet
pluralplanets
  1. 1
    [countable] a very large round object that moves around the Sun or another star

    planet Earth

    Mars is sometimes known as the red planet.

  2. 2

    the planet

    the planet Earth and everyone and everything on it: used, for example, when you are talking about the environment

    policies to protect the future of the planet

    Synonyms and related words for this sense of planet

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