A system of coinage in which a unit of currency is pegged to a combination of two or more metals in fixed proportions.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Banking & Finance) the use of an alloy of two or more metals in fixed relative value as the standard of value and currency
2. (Banking & Finance) the economic policies and doctrine supporting a symmetallic standard
[C19: from sym- + -metallism, on the model of bimetallism]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014