(chiefly science fiction) An inhabitant of the planet Jupiter; a Jovian.
(astronomy, obsolete) Pertaining to the planet Jupiter; Jovian.
(Roman mythology, obsolete) Pertaining to the Roman god Jove or Jupiter (the counterpart of the Greek god Zeus), the god of the sky and thunder and the king of the gods; Jovian.
(comparable) Cheerful and good-humoured; jolly, merry.
(not comparable, astrology, obsolete) Pertaining to the astrological influence of the planet Jupiter; having the characteristics of a person under such influence (see sense 1).