When a Council Deprives an Archbishop of "Sacerdotal Communion"?

On pg. 13 of the c. 1930 booklet, "Ephesus and Its Great Council," by T. A. Johnston, is found the following (excerpt from a quote by the said Ecumenical Council on the condemnation of Nestorius): > ...The Lord Jesus Christ whom he blasphemed decides by this holy Council that Nestorius is deprived of his episcopal dignity and of sacerdotal communion. I interpret this as the Council deprived Nestorius of his archbishopric in Constantinople; but, I am unclear as to what "sacerdotal communion" means. Does this mean that Nestorius is forbidden to receive Holy Communion, which certainly would imply that he was excommunicated? Does it mean that he was stripped of his priestly dignity, i.e., laicized? I don't ever recall having seen this term elsewhere.