prəˈpəlshən, prōˈ- noun
( -s )
Etymology: Latin propuls us (past participle of propellere to drive away, propel) + English -ion — more at propel
1. obsolete : the action of driving out or forth : expulsion , ejection
2. : the action of driving forward or ahead : action or process of propelling
propulsion of ships by steam turbine
problems of rocket propulsion
3. : something that propels : a driving or inciting force or influence
in the propulsion and in the excitement that can be provoked by forceful and expert pianists — Arthur Berger
4. : tendency to fall forward in walking (as in paralysis agitans)