Definition of "propulsion" []

• The process of driving or propelling. (noun)
• A driving or propelling force. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The main propulsion system processor of the digital autopilot converts body axis and attitude error signals generated in TVC into pitch and yaw nozzle deflection commands for the main engines."
• "Flying some X33 types of vehicles to get real flight experience in propulsion and materials."
• "The propulsion is all-chemical, and requires no new technology development."