In previous centuries , this language had served as an administrative language in a large part of the Slavic world .
Language was still used on a large scale in Orthodox liturgy , where it played a role similar to Latin in the West .
In previous centuries , this language had served as an administrative language in a large part of the Slavic world , and it was still used on a large scale in Orthodox liturgy , where it played a role similar to Latin in the West .