rocketrock‧et1 /ˈrɑkɪt/ ●●● noun [countable] 1 a vehicle used for traveling or carrying things into space, which is shaped like a big tube2a weapon shaped like a big tube: They began firing rockets at the ship.3a type of firework [Origin: 1600–1700 Italian rocchetta “small stick used in spinning thread,” from rocca “stick used in spinning”]