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Related to Old Bulgarian: Old Russian
See Old Church Slavonic.
(Languages) another name for Old Church Slavonic
Old′ Church′ Slavon′ic
the oldest attested Slavic language, extant in a group of manuscripts written before c1100, largely scripture and liturgical translations that were the outcome of Cyril and Methodius's mission to the Moravian Slavs in 863. Abbr.: OCS