Provides not only a literal definition, but a contextual one along with connotations associated with the word in history. For example, looking up a simple definition of the word "fire" in a regular dictionary would yield:
The phenomenon of combustion manifested in light, flame, and heat.
Of course a regular dictionary would also provide other definitions such as burning passion, liveliness of imagination, and firearms.
This dictionary, on the other hand, will provide the same definitions, among many others with notes such as:
Anciently, fire, air, earth, and water were regarded as the four elements of which all things are composed.
Splendor; brilliancy; luster; hence, a star.
Intellectual and moral enthusiasm; capacity for ardor and zeal.
A lovely, reliable, pocket writer's dictionary. A true companion, a gem. It's nice to have a friend.