Prompt

a cue given to a performer (usually the beginning of the next line to be spoken)

(computer science) a symbol that appears on the computer screen to indicate that the computer is ready to receive a command

give an incentive for action

serve as the inciting cause of

assist (somebody acting or reciting) by suggesting the next words of something forgotten or imperfectly learned

according to schedule or without delay

ready and willing or quick to act

performed with little or no delay