Definitions of erosion:

  • noun:   (geology) the mechanical process of wearing or grinding something down (as by particles washing over it)
  • noun:   a gradual decline of something
    Example: "After the accounting scandal there was an erosion of confidence in the auditors"
  • noun:   condition in which the earth's surface is worn away by the action of water and wind
  • noun:   erosion by chemical action