- Rom. Myth. the chief deity, god of thunder and the skies: identified with the Greek Zeus
- the largest planet of the solar system and the fifth in distance from the sun: it has a ring composed of microscopic dustlike particles: diameter, c. 142,980 km (c. 88,850 mi); period of revolution, 11.86 earth years; period of rotation, 9.92 hours; 64 satellites; symbol, ?
Origin of JupiterClassical Latin Juppiter, origin, originally a vocative from bases of Jovis, Jove and pater, father