Kōjien is a single-volume Japanese dictionary first published by Iwanami Shoten in 1955. It is widely regarded as the most authoritative dictionary of Japanese, and newspaper editorials frequently cite its definitions. As of 2007, it had sold 11 million copies.
Kōjien 7th edition (2018) displayed at a bookstore in Tokyo
Kōjien 2nd edition (1969)
Iwanami Shoten, Publishers is a Japanese publishing company based in Tokyo.
Iwanami Shoten