Pirate originally refers to a person who attacks and robs ships at sea, but in modern usage it has several extended meanings:
1. Pirate - someone who illegally copies and distributes copyrighted material
2. Pirate - an unauthorized radio or television broadcaster
3. Pirate - in sports, a player who is very aggressive in stealing the ball
4. Pirate - a term used in the tech world to describe someone who hacks or cracks software