jupiter Meaning, Definition & Usage

  1. noun the largest planet and the 5th from the sun; has many satellites and is one of the brightest objects in the night sky
  2. noun (Roman mythology) supreme god of Romans; counterpart of Greek Zeus
    Jove.

WordNet

Ju"pi*ter noun
Etymology
L., fr. Jovis pater. See Jove.
Definitions
  1. (Rom. Myth.) The supreme deity, king of gods and men, and reputed to be the son of Saturn and Rhea; Jove. He corresponds to the Greek Zeus.
  2. (Astron.) One of the planets, being the brightest except Venus, and the largest of them all, its mean diameter being about 85,000 miles. It revolves about the sun in 4,332.6 days, at a mean distance of 5.2028 from the sun, the earth's mean distance being taken as unity.

Webster 1913