"The largest of its kind among all existing ancient Japanese dictionaries, Kadokawa Kogo Daijiten contains a rich collection of approximately 100,000 headwords, covering historical classical and colloquial terms. The dictionary incorporates the latest research achievements at the time of publication, in particular for the middle ages and early modern age, for which a large number of words including legal terms, economic terms, popular terms and jargon have been selected. Formerly considered to be outside the scope of ancient Japanese dictionaries, this dictionary also endeavors to cover proper nouns, such as personal and place names, with encyclopedic commentaries as well as examples of usage and sources."