Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
Lagrange, Comte Joseph Louis de 1736-1813; Fr. mathematician & astronomer
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The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
, Comte Joseph Louis 1736-1813.
French mathematician and astronomer. He developed the calculus of variations (1755) and made a number of other contributions to the study of mechanics.