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Meaning of Manhattan Project

Manhat'tan Proj"ect

Pronunciation: [key]
  1. the unofficial designation for the U.S. War Department's secret program, organized in 1942, to explore the isolation of radioactive isotopes and the production of an atomic bomb: initial research was conducted at Columbia University in Manhattan.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.