Definitions:

1. The action or process of driving or moving something forward. NOUN
   • Electric motors offer a sustainable form of propulsion for modern vehicles.
2. The generation of force or thrust to propel an object, vehicle, or entity in a desired direction. NOUN
   • The rocket's propulsion system ignited, sending it hurtling into space.

Synonyms:

• actuation
• driving force
• impulse
• momentum
• projection
• propelling
• push
• shove
• surge
• thrust