Noun:
1: major planet, planet (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
2: planet, satellite a person who follows or serves another
3: planet any celestial body (other than comets or satellites) that revolves around a star