Русско-англо-русский юридический словарь

A floating exchange rate is a regime where the currency price is set by the forex market based on supply and demand compared with other currencies. This is in contrast to a fixed exchange rate, in which the government entirely or predominantly determines the rate. (Investopedia)

A fixed exchange rate is a country's exchange rate regime under which the government or central bank ties the official exchange rate to another country's currency or to the price of gold. (Investopedia)