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Definition of IJN
1. Initialism. (US military nautical) (w Imperial Japanese Navy), the Japanese navy of imperial Imperial Japan, predecessor of the (w Japanese Maritime Self Defence Force), usually in reference to WWII. ¹
2. Initialism. (US military nautical) Imperial Japanese Navy ship, informal ship prefix used for a warship of the Imperial Japanese Navy, usually in reference to WWII. ¹
¹ Source: wiktionary.com