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August 15, 1945, the day on which the Allies announced the surrender of Japanese forces during World War II.
[V(ictory in) J(apan) Day.]
(Military) the day marking the Allied victory over Japan in World War II (Aug 15, 1945)
August 14, 1945, the day Japan accepted the Allied surrender terms in World War II, or September 2, 1945, the day the surrender was signed.
[V-J: victory over Japan]