The definition of luck, or chance, differs depending on many factors including the religious and emotional context of the one interpreting it. Finding a four-leaf clover is often considered lucky for the person who finds it, while the number 13 and black cats have long been associated with bad luck.
Luck, or chance, plays a major role in the short-term success of a poker player. While more skillful players win more money than their lesser skilled counterparts over a massive sample size, the skill factor can often be all but cancelled out by luck in a small sample size.