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1. Someone who uses another person's words or ideas as if they were his own
   - plagiarist, plagiarizer, plagiariser [Brit], literary pirate
    
2. Someone who robs at sea or plunders the land from the sea without having a commission from any sovereign nation
   - buccaneer, sea robber, sea rover
    
3. A ship that is manned by pirates
   - pirate ship

1. Copy illegally; of published material
    
2. Take arbitrarily or by force
   "The Cubans pirated the plane and flew it to Miami"
   - commandeer, hijack, highjack

Derived forms: pirating, pirates, pirated

See also: piracy, piratical

Type of: despoiler, freebooter, looter, pillager, plunderer, raider, ransacker, seize, ship, spoiler, steal, stealer, thief

Encyclopedia: Pirate