What is the meaning of impact?

noun

• The striking of one body against another.
• A forceful consequence; a strong effect.
  • usage: "the book had an important impact on my thinking"; "the book packs a wallop"
  • synonyms: wallop
• Influencing strongly.
  • usage: "they resented the impingement of American values on European culture"
  • synonyms: impingement, encroachment
• The violent interaction of individuals or groups entering into combat.
  • usage: "the armies met in the shock of battle"
  • synonyms: shock

verb

• Press or wedge together; pack together.
• Have an effect upon.
  • usage: "Will the new rules affect me"
  • synonyms: affect, bear upon, bear on, touch on, touch