What is meant by depreciation of domestic currency?

Currency depreciation implies that domestic currency has become less expensive in terms of foreign currency. If, in the initial situation, 1$=Rs.40 and in the final situation, 1$=Rs.50, then the rupee is depreciating against the dollar. This is because now 1$ can be used to purchase Rs 50 instead of Rs 40. Thus, the rupee has become less expensive.