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Definition of National Academy of Sciences
1. Noun. An honorary American society of scientists created by President Lincoln during the American Civil War.
Medical Definition of National Academy of Sciences
1. A united states organization of distinguished scientists and engineers established for the purpose of investigating and reporting upon any subject of art or science as requested by any department of government. The national research council organised by nas serves as the principal operating agency to stimulate and support research. (12 Dec 1998)