V-J DAY Meaning of V-J DAY in English V-J Day /ˌviː ˈdʒeɪ ˌdeɪ/ BrE AmE abbreviation for Victory over Japan Day; August 15th 1945, the day on which victory over Japan in World War II was celebrated Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012