Pertaining to or characteristic of the god Jove or Jupiter; Jove-like; powerful; majestic: as, Jovial attributes.Of or pertaining to the planet Jupiter: as, the Jovial satellites.In astrology, under the influence of the planet Jupiter; derived from Jupiter as a natal planet, which, like Jove himself, was regarded as the source of joy and happiness: as, the Jovial temperament.Hence [lowercase] Characterized by cheerfulness or gaiety; joyous; merry; jolly: opposed to grave: as, a jovial fellow.[lowercase] In alchemy, of or pertaining to tin.Synonyms Mirthful, etc. See jolly.