/ (French dalɑ̃bɛr) /
physics the principle that for a moving body the external forces are in equilibrium with the inertial forces; a generalization of Newton's third law of motion
Principal vs. PrincipleIs the head of a school called a principal or a principle? These two words are frustratingly similar, leaving even the most experienced English speakers to second-guess which word means what.
Word Origin for d'Alembert's principle
C18: named after Jean Le Rond d'Alembert (1717–83), French mathematician, physicist, and rationalist philosopher
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