noun, plural piracies.
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.
Also called stream capture. Geology. diversion of the upper part of one stream by the headward growth of another.

1545–55; earlier pyracie < Medieval Latin pīrātīa < Late Greek peirāteía. See pirate, -acy

antipiracy, noun, plural antipiracies, adjective
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World English Dictionary
piracy (ˈpaɪrəsɪ)
n , pl -cies
1.  (Brit) robbery on the seas within admiralty jurisdiction
2.  a felony, such as robbery or hijacking, committed aboard a ship or aircraft
3.  the unauthorized use or appropriation of patented or copyrighted material, ideas, etc
[C16: from Anglo-Latin pirātia, from Late Greek peirāteia; see pirate]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1419, from M.L. piratia (see pirate).
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

piracy definition

software piracy

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
The only way to ameliorate this problem is to control piracy from land.
But the technology to prevent piracy may not even work and could cost
  universities hundreds of thousands of dollars, critics say.
It also explains why online music piracy may at last be in decline.
Translate what you've learned about counterfeiting and piracy into a fact sheet
  alerting other kids to the problem.
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