pirate

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One who commits or practices piracy at sea.
• noun One who makes use of or reproduces the work of another without authorization.
• noun One who illegally intercepts or uses radio or television signals, especially one who operates an illegal television or radio station.
• intransitive verb To attack and rob (a ship at sea).
• intransitive verb To take (something) by piracy.
• intransitive verb To make use of or reproduce (another's work) without authorization.
• intransitive verb To act as a pirate; practice piracy.

from The Century Dictionary.

• noun One who without authority and by violence seizes or interferes with the ship or property of another on the sea; specifically, one who is habitually engaged in such robbery, or sails the seas for the robbery and plunder of merchant vessels; a freebooter or corsair; a sea-robber. See piracy.
• noun An armed vessel which sails without a legal commission, for the purpose of plundering other vessels indiscriminately on the high seas.
• noun A publisher, compiler, or bookseller who appropriates the literary or artistic labors of an author without compensation or permission; specifically, one who infringes on the copyright of another.
• noun Any pirate-perch.
• noun A stream that, by reason of its more favorable situation or its greater activity, encroaches upon the territory of a neigh-boring stream to such extent as to capture a part of its watercourse.
• To play the pirate; rob on the high seas.
• To appropriate and reproduce the literary or artistic work of another without right or permission; specifically, to infringe on the copyright of another.
• To commit piracy upon; play the pirate toward.
• To appropriate and publish without permission or legal right, as books, writings, etc.; use or reproduce illegally.

from the GNU version of the Collaborative International Dictionary of English.

• noun A robber on the high seas; one who by open violence takes the property of another on the high seas; especially, one who makes it his business to cruise for robbery or plunder; a freebooter on the seas; also, one who steals in a harbor.
• noun An armed ship or vessel which sails without a legal commission, for the purpose of plundering other vessels on the high seas.
• noun One who infringes the law of copyright, or publishes the work of an author without permission.
• noun (Zoöl.) a fresh-water percoid fish of the United States (Aphredoderus Sayanus). It is of a dark olive color, speckled with blackish spots.
• intransitive verb To play the pirate; to practice robbery on the high seas.
• transitive verb To publish, as books or writings, without the permission of the author.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A criminal who plunders at sea; commonly attacking merchant vessels, though often pillaging port towns.
• noun One who breaks intellectual property laws by reproducing protected works without permission
• verb transitive, nautical To appropriate by piracy, plunder at sea.
• verb transitive, intellectual property To create and/or sell an unauthorized copy of
• verb transitive, intellectual property To knowingly obtain an unauthorized copy of
• verb intransitive To engage in piracy.
• adjective Illegaly imitated or reproduced, said of a well-known trademarked product or work subject to copyright protection and the counterfeit itself.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun someone who uses another person's words or ideas as if they were his own
• verb take arbitrarily or by force
• noun a ship that is manned by pirates
• verb copy illegally; of published material
• noun someone who robs at sea or plunders the land from the sea without having a commission from any sovereign nation