Entry 1 sense Webster, 1913 Jovian /jōv'-ē-ən/ · Jo·vi·an · IPA /ˈd͡ʒoʊ.vi.ən/ 01 prop. a. Of or pertaining to Jove, or Jupiter (either the deity or the planet). 1. Of or pertaining to Jove, or Jupiter (either the deity or the planet).