post-

  1. 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)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for post-

post-

prefix
  1. after in time or sequence; following; subsequentpostgraduate
  2. behind; posterior topostorbital

Word Origin for post-

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

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

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.

post- in Science

post-

  1. 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.