- practice of a pirate; robbery or illegal violence at sea.
- the unauthorized reproduction or use of a copyrighted book, recording, television program, patented invention, trademarked product, etc.: The record industry is beset with piracy.
- diversion of the upper part of one stream by the headward growth of another.
- robbery on the seas within admiralty jurisdiction
- a felony, such as robbery or hijacking, committed aboard a ship or aircraft
- the unauthorized use or appropriation of patented or copyrighted material, ideas, etc
