D defs.my
Entry 2 senses Webster, 1913

Propulsion

/prəp-ŭl'-shən/ · Pro·pul·sion · IPA /pɹəˈpʌlʃən/
01 n. The act driving forward or away; the act or process of propelling; as, steam propulsion.
  1. 1.
    The act driving forward or away; the act or process of propelling; as, steam propulsion.
  2. 2.
    An impelling act or movement.
    “God works in all things; all obey His first propulsion.” Whittier.