| English | Russian |
| ecumenical council | вселенский собор |
| ecumenical movement | экуменическое движение |
| ecumenical movement | экуменизм |
| Ecumenical Patriarch | Вселенский патриарх (Патриарх Константинопольский) |
| Ecumenical Patriarchate of Constantinople | Вселенский патриархат константинопольский (Honorary primacy of the Eastern Orthodox autocephalous churches; it is also known as the "ecumenical patriarchate", or "Roman" patriarchate) |
| Ecumenical Youth Council in Europe | Экуменический Совет Молодёжи в Европе |
| Eighth Ecumenical Council | Восьмой Вселенский собор (869-870, a council of the Christian church, meeting in Constantinople. The Roman church eventually recognized it as ecumenical, but the Eastern church for the most part denied its ecumenicity and continues to recognize only the first seven ecumenical councils) |
| Fifth Ecumenical Council | Пятый Вселенский собор (553, the council of the Christian church, meeting under the presidency of Eutychius, patriarch of Constantinople) |
| Second Ecumenical Council | Второй Вселенский собор (381, the council of the Christian church summoned by the emperor Theodosius I and meeting in Constantinople. Doctrinally, it promulgated what became known to the church as the Nicene Creed) |
| Sixth Ecumenical Council | Шестой Вселенский собор (680, the council of the Christian church summoned by the emperor Constantine IV and meeting at Constantinople) |
