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Leitourgia (λειτουργία)
Liturgy or divine service; the sacred actions by which the hierarchy functions and divine mysteries are celebrated.
Primary texts: Ecclesiastical Hierarchy, Chapters 3-7, Epistle 8
Logos (Λόγος)
Word or divine reason; both the Second Person of the Trinity and the divine principles or ideas according to which creation is ordered.
Primary texts: Divine Names, Chapters 1-2, Epistle 3