-sē, -si noun
Etymology: Greek heterodoxia, from heterodoxos + -ia -y
1. : the quality or state of being heterodox : departure from orthodoxy
the unbridled heterodoxy of the gay nineties — M.L.Bach
2. : a heterodox opinion or doctrine
revived the long-decaying … heterodoxy and established it as the religion of the Persian state — H.A.R.Gibb