"Multiple currencies" refers to the use of different forms of money in a certain context or situation. It means that there are multiple types of currency that people can use to buy or sell goods and services. Full definition
Dating Factory websites feature billing in multiple currencies with flexible payment options and pricing policies. (datingfactory.cz)
There are other features as well, supporting multiple currencies in one chain and ability not to use currency at all, private incubator and marketplace and other. (captainaltcoin.com)
This tutorial expresses my opinion on how accounting with multiple currencies should work. (mathstat.dal.ca)