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Le Chatelier's principle

noun
  1. chem the principle that if a system in chemical equilibrium is subjected to a disturbance it tends to change in a way that opposes this disturbance
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Word Origin

C19: named after H. L. Le Chatelier (1850–1936), French chemist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012