pirate

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. One who robs at sea or plunders the land from the sea without commission from a sovereign nation.
2. n. A ship used for this purpose.
3. n. One who preys on others; a plunderer.
4. n. One who makes use of or reproduces the work of another without authorization.
5. n. One that operates an unlicensed, illegal television or radio station.
6. v. To attack and rob (a ship at sea).
7. v. To take (something) by piracy.
8. v. To make use of or reproduce (another's work) without authorization.
9. v. To act as a pirate; practice piracy.

Century Dictionary and Cyclopedia

1. n. 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.
2. n. An armed vessel which sails without a legal commission, for the purpose of plundering other vessels indiscriminately on the high seas.
3. n. 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.
4. n. Any pirate-perch. Synonyms Thief, Brigand, etc. (see robber), corsair, bucaneer.
5. To play the pirate; rob on the high seas.
6. To appropriate and reproduce the literary or artistic work of another without right or permission; specifically, to infringe on the copyright of another.
7. To commit piracy upon; play the pirate toward.
8. To appropriate and publish without permission or legal right, as books, writings, etc.; use or reproduce illegally.
9. n. 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.

Wiktionary

1. n. A criminal who plunders at sea; commonly attacking merchant vessels, though often pillaging port towns.
2. n. One who breaks intellectual property laws by reproducing protected works without permission
3. v. To appropriate by piracy, plunder at sea.
4. v. To create and/or sell an unauthorized copy of
5. v. To knowingly obtain an unauthorized copy of
6. v. To engage in piracy.
7. adj. Illegaly imitated or reproduced, said of a well-known trademarked product or work subject to copyright protection and the counterfeit itself.

GNU Webster's 1913

1. n. 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.
2. n. An armed ship or vessel which sails without a legal commission, for the purpose of plundering other vessels on the high seas.
3. n. One who infringes the law of copyright, or publishes the work of an author without permission.
4. v. To play the pirate; to practice robbery on the high seas.
5. v. To publish, as books or writings, without the permission of the author.

WordNet 3.0

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