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Definition of the Manhattan Project from the Oxford Advanced Learner's Dictionary

 

the Manhattan Project

 
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the secret US project to develop the atom bomb, begun in 1942. It involved a team of scientists led by J Robert Oppenheimer, first at Oak Ridge, Tennessee, and later at Los Alamos, New Mexico, where the bomb was built. The first bomb was exploded as a test near Alamogordo, New Mexico, on 16 July 1945.