planet meaning and definition

PLANET noun

Definition of planet (noun)

1. (astronomy) any of the nine large celestial bodies in the solar system that revolve around the sun and shine by reflected light; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto in order of their proximity to the sun; viewed from the constellation Hercules, all the planets rotate around the sun in a counterclockwise direction
   • synonyms: major planet
2. a person who follows or serves another
   • synonyms: satellite
3. any celestial body (other than comets or satellites) that revolves around a star