superquintessential UK /ˌsuː.pəˌkwɪn.təˈsɛn.ʃəl/US /ˌsu.pəɹˌkwɪn.təˈsɛn.ʃəl/ adjective1 •(rare) Of or relating to superquintessence.PHILOSOPHERS may argue about the perfectibility of the superquintessential. — 1991