A family of manuscripts which share similar traits; the variety of a language which is used in such manuscripts.
The existence of two major literary centres in the First Bulgarian Empire led to the emergence of two recensions of Old Church Slavonic: the Bulgarian Recension and the Macedonian Recension.
The Russian recension of Old Church Slavonic emerged after the 10th century and was characterized by the substitution of /u/ for the nasal sound /õ/.