'Depletion' definitions:

Definition of 'depletion'

From: WordNet
noun
The act of decreasing something markedly
noun
The state of being depleted

Definition of 'Depletion'

From: GCIDE
  • Depletion \De*ple"tion\, n. [Cf. F. d['e]pl['e]tion.]
  • 1. The act of depleting or emptying. [1913 Webster]
  • 2. (Med.) the act or process of diminishing the quantity of fluid in the vessels by bloodletting or otherwise; also excessive evacuation, as in severe diarrhea. [1913 Webster]