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

      

    planet

     noun
    noun
    BrE BrE//ˈplænɪt//
     
    ; NAmE NAmE//ˈplænɪt//
     
    The universe
     
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  1. 1  [countable] a large round object in space that moves around a star (such as the sun) and receives light from it the planets of our solar system the planet Earth/Venus/Mars Wordfinderclimate, earth, equator, equinox, hemisphere, International Date Line, latitude, map, planet, tropic See related entries: The universe
  2. 2  the planet [singular] used to mean ‘the world’, especially when talking about the environment the battle to save the planet
  3. Word Origin Middle English: from Old French planete, from late Latin planeta, planetes, from Greek planētēs ‘wanderer, planet’, from planan ‘wander’.Extra examples He looked like something from another planet! How many planets orbit the sun? Hubble has found around 100 new extrasolar planets. She believes there is life on other planets. The spacecraft is currently in orbit around the red planet. We are destroying the planet with our fossil-fuel lifestyle. Will recycling help save the planet? creatures from an alien planet rocky planets like Venus and Mars the outer planets of our solar system the search for Earth-like planetsIdioms
    to be on another planet, what planet is somebody on?
     
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    (informal, humorous) used to suggest that somebody’s ideas are not realistic or practical He thinks being a father is easy. What planet is he on?
See the Oxford Advanced American Dictionary entry: planet