Noun erosion has 4 senses
  1. erosion, eroding, eating away, wearing, wearing away - (geology) the mechanical process of wearing or grinding something down (as by particles washing over it)
    --1 is a kind of geological process, geologic process
    --1 has particulars:
     chatter mark; ablation; abrasion, attrition, corrasion, detrition; beach erosion; deflation; planation; soil erosion
    Derived form: verb erode2
  2. erosion - condition in which the earth's surface is worn away by the action of water and wind
    --2 is a kind of
    environmental condition
    Derived forms: verb erode1, verb erode2
  3. erosion - a gradual decline of something; "after the accounting scandal there was an erosion of confidence in the auditors"
    --3 is a kind of
    decline, diminution
  4. corrosion, corroding, erosion - erosion by chemical action
    --4 is a kind of chemical process, chemical change, chemical action
    --4 has particulars: pitting, roughness, indentation; rust, rusting
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