Synaxis

Icon of the Synaxis of the Theotokos (Pskov, 17th century).

A synaxis (Greek: σύναξις "gathering"; Slavonic: собор, sobor) is a liturgical assembly in Eastern Christianity (the Eastern Orthodox Church and those Eastern Catholic Churches which follow the Byzantine Rite), generally for the celebration of Vespers, Matins, Little Hours and the Divine Liturgy.