Nihon Kokugo Daijiten

The Nihon kokugo daijiten (日本国語大辞典?), often abbreviated as the Nikkoku (日国?) and sometimes known in English as Shogakukan's Japanese Dictionary, is the largest Japanese language dictionary published. In the period from 1972 to 1976, Shogakukan published the 20-volume first edition. The 14-volume second edition was published in the period from November 2000 to December 2001. It includes substantial additions to and improvements over the first edition.