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
- n. Haste or speed in traveling, like that of a post or courier.
- adv. With speed or expedition
from The Century Dictionary and Cyclopedia
- n. Haste or speed like that of a post or courier in traveling.
- 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.”]
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)