Happening or existing in the period after a war, especially the time after World War II.
Compound of post- (after) and war, combining in English during the early 20th century as conflicts became defining historical markers. Became especially common after WWII to describe the new world order.
The 'postwar period' after 1945 completely reshaped civilization—nuclear weapons existed, the Cold War began, and countries that had fought each other became allies overnight. It's basically when the modern world as we know it got created.
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