from The American Heritage® Dictionary of the English Language, 4th Edition

  • adv. With great speed; rapidly.
  • n. Archaic Great speed; rapidity.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adv. quickly, as fast as someone travelling post; with great speed
  • n. Alternative spelling of post-haste.

from the GNU version of the Collaborative International Dictionary of English

  • adv. With speed or expedition
  • n. Haste or speed in traveling, like that of a post or courier.

from The Century Dictionary and Cyclopedia

  • With the haste of a post; with speed or urgent expedition: as, he traveled post-haste.
  • Expeditious; speedy; immediate.
  • [The edition of 1623 reads “post, post-haste.”]
  • n. Haste or speed like that of a post or courier in traveling.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adv. as fast as possible; with all possible haste


From the phrase haste, post, haste, a direction on letters.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From the former instruction on letters ‘haste, post, haste’, later reinterpreted as a compound of post + haste. (Wiktionary)



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