depletion-n; 2 Senses

Sense Number 1: the activity of removing a resource

Commentary: DEPLETION[+activity][+removal][+resource]
NOTE: implies an ongoing taking of resource by an agent/actor

The continued depletion of the ozone layer is causing concern among scientists.
The land's value was diminished by depletion of its mineral deposits.
The oil company got a tax deduction for its gradual depletion of oil reserves.

WordNet 3.0 Sense Numbers: 1

Sense Number 2: the state of having less resource

Commentary: DEPLETION[+state][+result][+decrease][+resource]
NOTE: implies a resulting state of less of a resource, not the taking activity

Bob described his sudden depletions of energy to his doctor.
John noticed a significant depletion of funds in his savings account on his last bank statement.
The coroner's report stated that a depletion of oxygen in the room was the cause of asphyxiation.

WordNet 3.0 Sense Numbers: 2