• (GA) IPA: /əˈɹoʊʒən/
  • (RP) IPA: /əˈɹəʊʒən/


  1. (uncountable) The result of having been worn away or eroded, as by a glacier on rock or the sea on a cliff face.
    • 1995, Graham Linehan & al., "Good Luck, Father Ted", Father Ted Series 1, Episode 1, Channel Four:
      Father Ted: The cliffs were gone? How could they just disappear?
      Dougal: Erosion.
    • 2012, George Monbiot, Guardian Weekly, August 24, p.20
      Even second-generation biofuel#Noun|biofuels, made from crop wastes or wood, are an environmental disaster, either extending the cultivated area or removing the straw and stover#Noun|stovers which protect the soil from erosion and keep carbon and nutrient#Noun|nutrients in the ground.
  2. (uncountable) The changing of a surface by mechanical action, friction, thermal expansion contraction, or impact.
  3. (uncountable, figurative) The gradual loss of something as a result of an ongoing process.
    the erosion of a person's trust
    trademark erosion, caused by everyday use of the trademarked term
  4. (uncountable) Destruction by abrasive action of fluids.
  5. (mathematics, image processing) One of two fundamental operations in morphological image processing from which all other morphological operations are derived.
  6. (dentistry) Loss of tooth enamel due to non-bacteriogenic chemical processes.
  7. (medicine) A shallow ulceration or lesion, usually involving skin or epithelial tissue.
  8. (math) In morphology, a basic operation (denoted ⊖); see Erosion (morphology).
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