Being on time; punctual. Carried out or performed without delay: a prompt reply. To move to act; spur; incite: A noise prompted the guard to go back and investigate. To give rise to; inspire: The accident prompted a review of school safety policy. To assist with a reminder; remind. To assist (an actor or reciter) by providing the next words of a forgotten passage; cue. The act of prompting or giving a cue. A reminder or cue. Computer Science A symbol that appears on a monitor to indicate that the computer is ready to receive input. Business A prompt note. Business The time limit stipulated in a prompt note.