| the oldest attested Slavic language, an ecclesiastical language written first by Cyril and Methodius in a Bible translation of the 9th century and continued in use for about two centuries. It represents the South Slavic, Bulgarian dialect of 9th-century Salonika with considerable addition of other South and West Slavic elements. Abbreviation: OCS |
| Old Church Slavonic n. The medieval Slavic language used in the translation of the Bible by Cyril and Methodius and in early literary manuscripts and still used as a liturgical language by several churches of Eastern Orthodoxy. Also called Church Slavonic, Old Bulgarian. |
