jet engine: a gas turbine produces a stream of hot gas that propels a jet plane by reaction propulsion
reaction-propulsion engine: a jet or rocket engine based on a form of aerodynamic propulsion in which the vehicle emits a high-speed stream
hanseatic league: a commercial and defensive confederation of free cities in northern Germany and surrounding areas; formed in 1241 and most influential in the 14th century when it included over 100 towns and functioned as an independent political power; the last official assembly was held in 1669