In a "freely" and "managed" floating currency regime, a loss in currency value is conventionally called a "depreciation", whereas an increase of currency's international value will be called "appreciation". If the dollar rises from 10,000 yen to 12,000 yen, then it has shown an appreciation of 20%. Symmetrically, the yen has undergone a 8.3% depreciation. (taken online)
But central banks can also declare a fixed exchange rate, offering to supply or buy any quantity of domestic or foreign currencies at that rate. In this case, one talks of a "fixed exchange rate".
Under the latter regime, a loss of value, usually forced by market or a purposeful policy action, is called a "devaluation", whereas an increase of international value is a "revaluation". One can call it a purposeful Governmental intervention for economic reasons.
In other words currency depreciation/appreciation is controlled by the international currency rates based on the international stock market indicators; and currency devaluation is controlled by the central banks (RBI in India's case) which forces exchange rates, that subsequently devalues the currency.
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