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a prefix, meaning “behind,” “after,” “later,” “subsequent to,” “posterior to,” occurring originally in loanwords from Latin (postscript), but now used freely in the formation of compound words (post-Elizabethan; postfix; postgraduate; postorbital).
Origin of post-
< Latin, combining form representing post (adv. and preposition) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for post-


after in time or sequence; following; subsequent: postgraduate
behind; posterior to: postorbital
Word Origin
from Latin, from post after, behind
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for post-

word-forming element meaning "after," from Latin post "behind, after, afterward," from *pos-ti (cf. Arcadian pos, Doric poti "toward, to, near, close by;" Old Church Slavonic po "behind, after," pozdu "late;" Lithuanian pas "at, by"), from PIE *apo- (cf. Greek apo "from," Latin ab "away from" see apo-).

Online Etymology Dictionary, © 2010 Douglas Harper
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post- in Medicine

post- pref.

  1. After; later: postpartum.

  2. Behind; posterior to: postaxial.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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post- in Science
A prefix that means "after," as in postoperative, after an operation, or "behind," as in postnasal, behind the nose or nasal passages.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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