i Register
In some senses, depletion is marked as archaic. Watch for register when choosing this word.
noun
The act of depleting, or the state of being depleted; exhaustion.
The Great Northern 4-4-0s have all vanished, and there has been some depletion in the ranks of North British "Glens" and "Scotts."
The consumption of a resource faster than it can be replenished.
The act of relieving congestion or plethora, by purging, blood-letting, or reduction of the system by abstinence.
gradual expense or use of natural resources over time.