Your desk copy of Websters is NOT the definitive definition of what constitutes piracy, Will.
The 1982 United Nations Convention on the Law of the Sea (UNCLOS)
(article 101) defines piracy as follows:
“Piracy consists of any of the following acts:
(a) any illegal acts of violence or detention, or any act of depredation, committed for
private ends by the crew or the passengers of a private ship or a private aircraft,
and directed:
(i) on the high seas, against another ship or aircraft, or against persons or property
on board such ship or aircraft;
(ii) against a ship, aircraft, persons or property in a place outside the jurisdiction of
any State;
(b) any act of voluntary participation in the operation of a ship or of an aircraft with
knowledge of facts making it a pirate ship or aircraft;
(c) any act inciting or of intentionally facilitating an act described in sub-paragraph
(a) or (b).”
http://www.imo.org/includes/blastDat...D7430/1073.pdf
International Maritime Organization