noun (n)

• the resistance encountered when one body is moved in contact with another(noun.phenomenon)

  Synonym:
  friction
  

  source: wordnet30
• representation consisting of a copy (as of an engraving) made by laying paper over something and rubbing it with charcoal(noun.artifact)

  source: wordnet30
• effort expended in moving one object over another with pressure(noun.act)

  Synonym:
  detrition, friction
  

  source: wordnet30