Definitions of hacker:

• noun:   a programmer for whom computing is its own reward; may enjoy the challenge of breaking into other computers but does no harm

  Example: "True hackers subscribe to a code of ethics and look down upon crackers"

• noun:   someone who plays golf poorly
• noun:   a programmer who breaks into computer systems in order to steal or change or destroy information as a form of cyber-terrorism
• noun:   one who works hard at boring tasks
• name:  A surname (common: 1 in 20000 families; popularity rank in the U.S.: #2313)