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posthaste

 - 4 dictionary results

post⋅haste

  [pohst-heyst]
Use posthaste in a Sentence
–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; post 3 + haste
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To posthaste
post·haste   (pōst'hāst')   
adv.  With great speed; rapidly.
n.   Archaic
Great speed; rapidity.

[From the phrase haste, post, haste, a direction on letters.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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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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, © 2001 Douglas Harper
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