noun (n)

• erosion by friction(noun.process)

  Synonym:
  abrasion, corrasion, detrition
  

  source: wordnet30
• the wearing down of rock particles by friction due to water or wind or ice(noun.phenomenon)

  Synonym:
  abrasion, detrition, grinding
  

  source: wordnet30
• sorrow for sin arising from fear of damnation(noun.feeling)

  Synonym:
  contriteness, contrition
  

  source: wordnet30
• a wearing down to weaken or destroy(noun.event)

  Example:
  A war of attrition.
  

  source: wordnet30
• the act of rubbing together; wearing something down by friction(noun.act)

  source: wordnet30
• The act of rubbing together; friction; the act of wearing by friction, or by rubbing substances together; abrasion.(noun)

  source: webster1913