Definitions of attrition:

  • noun:   the act of rubbing together; wearing something down by friction
  • noun:   a wearing down to weaken or destroy
    Example: "A war of attrition"
  • noun:   sorrow for sin arising from fear of damnation
  • noun:   erosion by friction
  • noun:   the wearing down of rock particles by friction due to water or wind or ice