amount of substance
a measure of the number of entities (atoms, molecules, ions, electrons, etc) present in a substance, expressed in moles
What’s Wrong With The Word “Addict”?The word addict dates back to at least the 1500s, adapted from the Latin addictus, meaning "assigned, surrendered." But, if experts in drug addiction treatment have their way, use of the word addict as a noun will soon see its end date.
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