Luck

n.
  1. That which happens to a person; an event, good or ill, affecting one's interests or happiness, and which is deemed casual; a course or series of such events regarded as occurring by chance; chance; hap; fate; fortune; often, one's habitual or characteristic fortune; as, good, bad, ill, or hard luck. Luck is often used by itself to mean good luck; as, luck is better than skill; a stroke of luck.
    2. Luck penny ,
    a small sum given back for luck to one who pays money.
    To be in luck ,
    to receive some good, or to meet with some success, in an unexpected manner, or as the result of circumstances beyond one's control; to be fortunate.