Rocket  —n. 1 cylindrical firework or signal etc. Propelled to a great height after ignition. 2 engine operating on the same principle, providing thrust but not dependent on air intake. 3 rocket-propelled missile, spacecraft, etc. 4 slang severe reprimand. —v. (-t-) 1 a move rapidly upwards or away. B increase rapidly (prices rocketed). 2 bombard with rockets. [french roquette from italian]