Redenomination in the context of "Revaluation"

Revaluation is a change in a price of a good or product, or especially of a currency, in which case it is specifically an official rise of the value of the currency in relation to a foreign currency in a fixed exchange rate system. In contrast, a devaluation is an official reduction in the value of the currency. Under floating exchange rates, a rise in a currency's value is an appreciation. Altering the face value of a currency without changing its purchasing power is a redenomination, not a revaluation (this is typically accomplished by issuing a new currency with a different, usually lower, face value and a different, usually higher, exchange rate while leaving the old currency unchanged; then the new replaces the old).

In a fixed exchange rate system, the central bank maintains an officially announced exchange rate by standing ready to buy or sell foreign currency at that rate. In general terms, revaluation of a currency is a calculated adjustment to a country's official exchange rate relative to a chosen baseline. The baseline could in principle be anything from wage rates to the price of gold to a foreign currency. In a fixed exchange rate regime, only a decision by a country's government (specifically, its central bank) can alter the official value of the currency.