Jupiter: Meaning and Definition of

Ju•pi•ter

1. Also calledthe supreme deity of the ancient Romans: the god of the heavens and of weather. Cf. Zeus.
2. the planet fifth in order from the sun, having an equatorial diameter of 88,729 mi. (142,796 km), a mean distance from the sun of 483.6 million mi. (778.3 million km), a period of revolution of 11.86 years, and at least 14 moons. It is the largest planet in the solar system. See table under
3. a medium-range U.S. ballistic missile of the 1950s, powered by a single liquid-fueled rocket engine.