piracy

Robbery or other serious acts of violence committed at sea.

The hijacking of an airplane.

Copyright or patent infringement.

The illegal interception or use of radio or television signals.

An instance of piracy.

In geology, that process whereby, because of a higher natural gradient, and therefore more efficient eroding power, one stream cuts back a divide and taps off the head-waters or a tributary of another stream. The captured stream usually turns a sharp angle into its new course and leaves a wind-gap where it formerly flowed. Also called stream-piracy.

Robbery upon the sea; robbery by pirates; the practice of robbing on the high seas.

Literary theft; any unauthorized appropriation of the mental or artistic conceptions or productions of another; specifically, an infringement of the law of copyright.

The act or crime of a pirate.