अवमूल्यन से आंतरिक दाम प्राय गिरते है l अवमूल्यन आर्थिक शब्दावली का एक हिस्सा है; जब किसी देश द्वारा मुद्रा की विनिमय दर अन्य देशों की मुद्राओं से कम कर दिया जाये ताकि निवेश को बढ़ावा मिल सके तो उसे अवमूल्यन कहते हैं।

In macroeconomics and modern monetary policy, a devaluation is an official lowering of the value of a country's currency within a fixed exchange-rate system, in which a monetary authority formally sets a lower exchange rate of the national currency in relation to a foreign reference currency or currency basket. The opposite of devaluation, a change in the exchange rate making the domestic currency more expensive, is called a revaluation. A monetary authority maintains a fixed value of its currency by being ready to buy or sell foreign currency with the domestic currency at a stated rate; a devaluation is an indication that the monetary authority will buy and sell foreign currency at a lower rate.