What is the meaning of diversion?

noun

• An activity that diverts or amuses or stimulates.
  • usage: "scuba diving is provided as a diversion for tourists"; "for recreation he wrote poetry and solved crossword puzzles"; "drug abuse is often regarded as a form of recreation"
  • synonyms: recreation
• A turning aside (of your course or attention or concern. )
  • usage: "a diversion from the main highway"; "a digression into irrelevant details"; "a deflection from his goal"
  • synonyms: deviation, digression, deflection, deflexion, divagation
• An attack calculated to draw enemy defense away from the point of the principal attack.
  • synonyms: diversionary attack