Definitions of luck:

  • noun:   an unknown and unpredictable phenomenon that causes an event to result one way rather than another
    Example: "Bad luck caused his downfall"
  • noun:   an unknown and unpredictable phenomenon that leads to a favorable outcome
    Example: "It was my good luck to be there"
  • noun:   your overall circumstances or condition in life (including everything that happens to you)
    Example: "The luck of the Irish"
  • name:  A surname (rare: 1 in 50000 families; popularity rank in the U.S.: #5091)