Latin took over the Greek word ekklesiastikos, which originally meant being called out to attend the state assembly. Ecclesiastical, I hope! Both terms may be used to refer to governance, polity, and the like, but “ecclesial” lacks the sense of referring to the ordained … (e.g. Ecclesial is obsolete. Ecclesiological: “of or relating to the understanding, doctrine, or concept of the church”. According to the Oxford English Dictionary, both terms list “of or pertaining to the church” as definitions. Ecclesiastical and ecclesiastic both describe something that is related to the Christian Church, something that is appropriate to be used in the Christian Church.Ecclesiastical and ecclesiastic may refer to the clergy, organization, writings or physical items in the Christian Church.Ecclesiastical and ecclesiastic are both adjectives, but ecclesiastic is also used as a noun. “Church architecture has enormous ecclesiological significance.”) Ecclesiastical: “of or relating to the church as an established institution”. As adjectives the difference between ecclesial and ecclesiastical is that ecclesial is while ecclesiastical is of or pertaining to the church. But whereas this is the only definition given for “ecclesial,” “ecclesiastical” boasts several other definitions, many of which refer to the clerical orders of the church.