They returned to the hall, that the chief staircase might be ascended, and the beauty of its wood, and ornaments of rich carving might be pointed out: having gained the top, they turned in an opposite direction from the gallery in which her room lay, and shortly entered one on the same plan, but superior in length and breadth.
There are no more uses of "breadth" in the book.
Show samples from other sources
The introductory courses are meant to add to breadth rather than depth of understanding.
a teacher must have a breadth of knowledge of the subject