Final answer:
The agreement between the Ethiopian and Orthodox Church to mention each other during the liturgy is related to specific feasts such as the Triumph of Orthodoxy and the celebration of the Eucharist.
Step-by-step explanation:
The agreement between the Ethiopian and Orthodox Church to mention each other during the liturgy is related to specific feasts. One example of a specific feast is the celebration of the Divine Liturgy on the first Sunday of Lent, known as the Triumph of Orthodoxy. This feast commemorates the restoration of images in the Eastern Orthodox Church. Another example is the celebration of the Eucharist, also known as the Holy Communion, which is a common feature in Byzantine churches and is mentioned during specific liturgical celebrations.