depletion

noun4

1. •
   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." — 1954
2. •
   The consumption of a resource faster than it can be replenished.
3. •
   gradual expense or use of natural resources over time.
4. •
   (no longer used) The act of relieving congestion or plethora, by purging, blood-letting, or reduction of the system by abstinence.