Meaning of “planet” in the English Dictionary

"planet" in British English

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planetnoun [ C ]

uk /ˈplæn.ɪt/ us /ˈplæn.ɪt/

B1 an extremely large, round mass of rock and metal, such as Earth, or of gas, such as Jupiter, that moves in a circular path around the sun or another star:

the planet Earth/Venus
Might there be intelligent life on other planets?

More examples

  • The planet Jupiter radiates twice as much heat from inside as it receives from the Sun.
  • an unmanned mission to the planet Mars
  • They launched a rocket to the planet Venus.
  • Environmentalists have no political axe to grind - they just want to save the planet.
  • Is it too late to repair the damage we have done to our planet?

(Definition of “planet” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"planet" in American English

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planetnoun [ C ]

us /ˈplæn·ɪt/

earth science an extremely large, round mass of matter, such as Earth or Mars, that moves in a circular path around the sun or another star

planetary
adjective [ not gradable ] us /ˈplæn·əˌter·i/

earth science

planetary scientists

(Definition of “planet” from the Cambridge Academic Content Dictionary © Cambridge University Press)