Heterodoxy

Heterodoxy, also Cacadoxy as opposed to Orthodoxy, is the belief in something other (hetera doksa or ετέρα δόξα) than the Orthodox Christian faith. In some senses, it is synonymous with heresy in that it is a departure from Orthodoxy, but it is distinct in that heresy by definition technically includes a specific choice to embrace and teach heterodox doctrine, usually accompanied by a formal anathema (condemnation) from a synod.

Heterodoxy is used to refer to all 'Christian' confessions which are not the Orthodox Church.