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.n. An armed vessel which sails without a legal commission, for the purpose of plundering other vessels indiscriminately on the high seas.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.n. Any pirate-perch.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.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.