1 [usually before noun] happening in a short period of timerapid change/expansion/growtha rapid rise/decline in salesThe patient made a rapid recovery.2 done or happening very quicklya rapid pulse/heartbeatThe guard fired four shots in rapid succession.The disease is spreading at a rapid rate.rapidityUsage note: fast / quick / rapidThese adjectives are frequently used with the following nouns:
rəˈpɪdəti ; rəˈpɪdətinoun [uncountable]the rapidity of economic growthThe disease is spreading with alarming rapidity. rapidly
ˈræpɪdli ; ˈræpɪdliadverba rapidly growing economyCrime figures are rising rapidly.
|fast ~||quick ~||rapid ~|