| Noun | 1. | erosion - (geology) the mechanical process of wearing or grinding something down (as by particles washing over it)geology - a science that deals with the history of the earth as recorded in rocks chatter mark - marks on a glaciated rock caused by the movement of a glacier ablation - the erosive process that reduces the size of glaciers beach erosion - the erosion of beaches geologic process, geological process - (geology) a natural process whereby geological features are modified deflation - (geology) the erosion of soil as a consequence of sand and dust and loose rocks being removed by the wind; "a constant deflation of the desert landscape" planation - the process of erosion whereby a level surface is produced soil erosion - the washing away of soil by the flow of water |
| 2. | erosion - condition in which the earth's surface is worn away by the action of water and wind environmental condition - the state of the environment | |
| 3. | erosion - a gradual decline of something; "after the accounting scandal there was an erosion of confidence in the auditors" decline, diminution - change toward something smaller or lower | |
| 4. | erosion - erosion by chemical action chemical action, chemical change, chemical process - (chemistry) any process determined by the atomic and molecular composition and structure of the substances involved pitting, indentation, roughness - the formation of small pits in a surface as a consequence of corrosion |