All dictionaries and databases of JapanKnowledge can be searched by a single search box, however, several major databases have individual interface for effective search. English Guide is available on each individual interface.
| 日本国語大辞典 Unabridged Dictionary of the Japanese Language |
 |
Digital version of the largest dictionary of Japanese language with half million headings and one million examples. You can limit search scope such as headings, full text, dialects and etymological theories. |
| 国史大辞典 Encyclopedia of Japanese History |
 |
Digitized version of all 15 volumes (17 books), which is one of the largest encyclopedias of Japanese history. You can search 54,000 entries as well as 4,000 subentries. In addition, you can conduct a search by specifying only the references or authors. |
| 日本歴史地名大系 Encyclopedia of Japanese Historical Place Names |
 |
Categorized 20,000 entries which encompass all of the prefectures of Japan plus Kyoto City. In addition to history of place names from print version, edited to reflect recent changes such as municipal mergers and changes in place names and link to Google map. |
For effective search, limit dictionaries and databases by categories.
