erosion in WordNet English dictionary

1. erosion by chemical action
   corrosion  corroding  erosion 
   
2. (geology) the mechanical process of wearing or grinding something down (as by particles washing over it)
   erosion  eroding  eating away  wearing  wearing away 
   
3. a gradual decline of something
   "after the accounting scandal there was an erosion of confidence in the auditors"
   erosion 
   
4. condition in which the earth's surface is worn away by the action of water and wind
   erosion