adjective, prompter, promptest.
done, performed, delivered, etc., at once or without delay: a prompt reply.
ready in action; quick to act as occasion demands.
quick or alert: prompt to take offense.
verb (used with object)
to move or induce to action: What prompted you to say that?
to occasion or incite; inspire: What prompted his resignation?
to assist (a person speaking) by suggesting something to be said.
Theater. to supply (an actor, singer, etc.) from offstage with a missed cue or forgotten line.
verb (used without object)
Theater. to supply forgotten lines, lyrics, or the like to an actor, singer, etc.
a limit of time given for payment for merchandise purchased, the limit being stated on a note of reminder (prompt note)
the contract setting the time limit.
the act of prompting.
something serving to suggest or remind.
Computers. a message or symbol from a computer system to a user, generally appearing on a display screen, requesting more information or indicating that the system is ready for user instructions.
take a prompt, (in acting) to move or speak in response to a cue.

1300–50; (v.) Middle English < Medieval Latin prōmptāre to incite, Latin: to distribute, frequentative of prōmere to bring out, equivalent to prō- pro-1 + (e)mere to take, buy; (adj.) late Middle English < Latin promptus ready, prompt, special use of past participle of prōmere

promptly, adverb
promptness, noun
overprompt, adjective
overpromptly, adverb
overpromptness, noun
quasi-prompt, adjective
quasi-promptly, adverb
unprompt, adjective
unpromptly, adverb
unpromptness, noun
unprompted, adjective

5. urge, spur, instigate, impel. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To promptness
World English Dictionary
prompt (prɒmpt)
1.  performed or executed without delay
2.  quick or ready to act or respond
3.  informal punctually
4.  (tr) to urge (someone to do something)
5.  to remind (an actor, singer, etc) of lines forgotten during a performance
6.  (tr) to refresh the memory of
7.  (tr) to give rise to by suggestion: his affairs will prompt discussion
8.  commerce
 a.  the time limit allowed for payment of the debt incurred by purchasing goods or services on credit
 b.  the contract specifying this time limit
 c.  Also called: prompt note a memorandum sent to a purchaser to remind him of the time limit and the sum due
9.  the act of prompting
10.  anything that serves to remind
11.  an aid to the operator of a computer in the form of a question or statement that appears on the screen showing that the equipment is ready to proceed and indicating the options available
[C15: from Latin promptus evident, from prōmere to produce, from pro-1 + emere to buy]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

mid-14c., from O.Fr. prompt (early 13c.), from L. promptus "brought forth, at hand, ready, quick," prop. pp. of promere "to bring forth," from pro- "forward" + emere "to take" (see exempt). Theatrical sense of "to assist a speaker with lines" is first recorded early 15c.
The adj. is first recorded early 15c.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But online publication can also enhance the promptness and extent of learned
  commentary on the published research.
Three rites fairly generally observed in gourmet dinners involve promptness,
  drinking, and smoking.
He read, edited and responded to stories with remarkable promptness and
  unfailing courtesy and professionalism.
The alert raised questions about the promptness of the warning and whether
  other models could have the same flaw.
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