Also called Jove. the supreme deity of the ancient Romans: the god of the heavens and of weather.Compare Zeus.
Astronomy. the planet fifth in order from the sun, having an equatorial diameter of 88,729 miles (142,796 km), a mean distance from the sun of 483.6 million miles (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.
Military. a medium-range U.S. ballistic missile of the 1950s, powered by a single liquid-fueled rocket engine.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for jupiter

earth, Mars, Mercury, Neptune, Pluto, Saturn, Uranus, Venus

Examples from the Web for jupiter

Contemporary Examples of jupiter

Historical Examples of jupiter

British Dictionary definitions for jupiter




(in Roman tradition) the king and ruler of the Olympian godsGreek counterpart: Zeus




the largest of the planets and the fifth from the sun. It has 67 satellites and is surrounded by a transient planar ring system consisting of dust particles. Mean distance from sun: 778 million km; period of revolution around sun: 11.86 years; period of axial rotation: 9.83 hours; diameter and mass: 11.2 and 317.9 times that of earth respectivelySee Galilean satellite
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for jupiter



c.1200, "supreme deity of the ancient Romans," from Latin Iupeter, from PIE *dyeu-peter- "god-father" (originally vocative, "the name naturally occurring most frequently in invocations" [Tucker]), from *deiw-os "god" (see Zeus) + peter "father" in the sense of "male head of a household" (see father). Cf. Greek Zeu pater, vocative of Zeus pater "Father Zeus;" Sanskrit Dyauspita "heavenly father." The planet name is attested from late 13c. Jupiter Pluvius "Jupiter as dispenser of rain" was used jocularly from 1864.

Online Etymology Dictionary, © 2010 Douglas Harper

jupiter in Science



The fifth planet from the Sun and the largest, with a diameter about 11 times that of Earth. Jupiter is a gas giant made up mostly of hydrogen and helium. It turns on its axis faster than any other planet in the solar system, taking less than ten hours to complete one rotation; this rapid rotation draws its atmospheric clouds into distinct belts parallel to its equator. Jupiter has more known moons by far than any other planet in the solar system-as many as 63, with new ones being discovered regularly in recent years-and it has a faint ring system that was unknown until 1979, when the Voyager space probe investigated the planet. A persistent anticyclonic storm known as the Great Red Spot is Jupiter's most prominent feature. See Table at solar system.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

jupiter in Culture


The Roman name of Zeus, the most powerful of the gods of classical mythology.


The fifth and largest planet from the sun (the Earth is third) is named Jupiter.


In astronomy, the largest planet in the solar system; the fifth major planet from the sun. Jupiter is largely composed of gases. It is named after the ruler of the Roman gods (see under “Mythology and Folklore”). Jupiter is visible from Earth.

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.