pro ‧ pul ‧ sion /prəˈpʌlʃ ə n/ BrE AmE noun [uncountable] technical
[ Date: 1600-1700 ; Language: Latin ; Origin: propulsus , past participle of propellere ; ⇨ ↑ propel ]
the force that drives a vehicle forward ⇨ propel
rocket/wind/nuclear/jet propulsion
research into liquid hydrogen as a means of propulsion
—propulsive /-sɪv/ adjective