Propulsation(n.) The act of driving away or repelling; a keeping at a distance.
Propulse(v. t.) To repel; to drive off or away.
Propulsion(n.) The act driving forward or away; the act or process of propelling; as, steam propulsion.
Propulsion(n.) An impelling act or movement.
Propulsive(a.) Tending, or having power, to propel; driving on; urging.

Words within propulsive