(of exchange rates) weighted according to the volume of trade between the various countries involved
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
Examples from the Web for trade-weighted
The trade-weighted dollar is worth almost exactly what it was three years ago.
The trade-weighted dollar is a measure of the value of the U.S. currency against the currencies of our main trading partners.