Revaluation means a change of a price of goods or products. This term is specially used as revaluation of a currency, where it means a rise of currency to the relation with a foreign currency in a fixed exchange rate. In floating exchange rate correct term would be 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).