n. the largest of the administrative districts of a fur company.
1765-75  (1933)  After all the Bisness Was Dun . . . thay Began to Draw of[f] for thare Differant Departments and Prepare for the Insewing winter.
1837  (1931)  The country in which the Hudson's Bay Company now trade is divided into four great districts, known by the names of the Northern, Southern, Columbia and Montreal Departments, in which there are 136 establishments.
1957  The Northern Department had been relieved of the greater part of its troublesome brigades -- and York Factory of her crown.