As a Noun: 1. A person in a theatre whose job is to remind an actor of words that he or she has forgotten during a performance. English = prompter. As a Verb or Adjective: 1. To remind an actor of the words he or she has forgotten during a performance, or of the time when they are meant to do something. English = prompt. 2. To assist an interpreter by providing words or signs he or she does not know or missed during an interpretation. English = prompt.