posthaste

[pohst-heyst]
adverb
1.
with the greatest possible speed or promptness: to come to a friend's aid posthaste.
noun
2.
Archaic. great haste.

Origin:
1530–40; post3 + haste

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
posthaste (ˈpəʊstˈheɪst)
 
adv
1.  with great haste; as fast as possible
 
n
2.  archaic great haste

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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Etymonline
Word Origin & History

posthaste
1545, usually said to be from "post haste" instruction formerly written on letters (attested from 1538), from post (3) "system for sending mail" + haste. The verb post "to ride or travel with great speed" is recorded from 1558.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary
posthaste [(pohst-hayst)]

Immediately, with great speed: “Get the flood warning to the media posthaste.”

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
So when there's a perceived advantage to be pressed, leverage it posthaste.
We are contacting some consultants to see who will accept the scope of work and will process an agreement posthaste.
He begged the commandant general to send more, posthaste.
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