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[la-plas] /laˈplas/
Pierre Simon
[pyer see-mawn] /pyɛr siˈmɔ̃/ (Show IPA),
Marquis de, 1749–1827, French astronomer and mathematician. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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/French laplas/
Pierre Simon (pjɛr simɔ̃), Marquis de Laplace. 1749–1827, French mathematician, physicist, and astronomer. He formulated the nebular hypothesis (1796). He also developed the theory of probability
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for Laplace

in scientific phrases, a reference to French astronomer and mathematician Pierre Simon, Marquis de Laplace (1749-1827).

Online Etymology Dictionary, © 2010 Douglas Harper
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Laplace in Science
  (lə-pläs', lä-)   
French mathematician and astronomer noted for his theory of a nebular origin of the solar system and his investigations into gravity and the stability of planetary motion. He also made important contributions to the theory of probability.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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