Pronunciation: (pī'ru-sē), [key]
1. practice of a pirate; robbery or illegal violence at sea.
2. the unauthorized reproduction or use of a copyrighted book, recording, television program, patented invention, trademarked product, etc.: The record industry is beset with piracy.
3. Also called stream capture. Geol.diversion of the upper part of one stream by the headward growth of another.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.