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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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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