(in physics, chemistry, etc.) a unit derived from fundamental units of length, mass, and time.
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a unit of measurement obtained by multiplication or division of the base units of a system without the introduction of numerical factors
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