jet propulsion

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Propulsion derived from the rearward expulsion of matter in a jet stream, especially propulsion by jet engines.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Propulsion that is caused by the expulsion of a jet of fluid, especially by a jet engine
• noun The study of devices propelled by jet propulsion

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun propulsion by means of the discharge of a jet of fluid toward the rear