noun (n)

• influencing strongly(noun.act)

  Example:
  They resented the impingement of American values on European culture.
  

  Synonym:
  encroachment, impact
  

  source: wordnet30
• a sharp collision produced by striking or dashing against something(noun.act)

  Synonym:
  impaction
  

  source: wordnet30
• The act of impinging.(noun)

  source: webster1913