When the average kinetic energy of the molecules goes up (a rise in temperature), the average speed of the molecules increases. And lower average kinetic energy of the molecules means they have lower speed. However, a change in average kinetic energy is not directly proportional to a change in average speed. 1.
An appreciation means an increase in the value of a currency. It means a currency is worth more in terms of foreign currency.
Webster Dictionary(2.00 / 1 vote)Rate this definition: Appreciate(verb) to set a price or value on; to estimate justly; to value. Appreciate(verb) to raise the value of; to increase the market price of; -- opposed to depreciate.