Real Dictionary

prompt
verb: If you prompt someone when they stop speaking, you encourage or help them to continue. If you prompt an actor, you tell them what their next line is when they have forgotten what comes next.
verb: To prompt someone to do something means to make them decide to do it.

prompt in American English
quick to act or to do what is required; ready, punctual, etc.
the time limit specified for the payment of an account
to urge into action; provoke
adjective: done, performed, delivered, etc., at once or without delay
intransitive verb: to supply forgotten lines, lyrics, or the like to an actor, singer, etc.
noun: a limit of time given for payment for merchandise purchased, the limit being stated on a note of reminder (prompt note)
transitive verb: to move or induce to action

prompt in British English
adjective: performed or executed without delay
adverb: punctually
noun: the time limit allowed for payment of the debt incurred by purchasing goods or services on credit
verb: to urge (someone to do something)