This volume investigates the evolution and usage of Latin within British sources from the 6th to the 16th centuries. The work, compiled under the direction of R. E. Latham, serves as a comprehensive lexicographical record of medieval Latin developments. By analyzing a vast array of printed and manuscript materials, the dictionary documents both the continuity of classical Latin and the emergence of new linguistic formations unique to the medieval period.

Scholars and historians regard this dictionary as a foundational reference for the study of medieval British documents. Experts frequently note the high level of academic rigor and the precision of the entries provided in this series.