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 ).

< Latin, combining form representing post (adv. and preposition) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  after in time or sequence; following; subsequent: postgraduate
2.  behind; posterior to: postorbital
[from Latin, from post after, behind]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

prefix meaning "after," from L. post "behind, after, afterward," from *pos-ti (cf. Arcadian pos, Doric poti "toward, to, near, close by;" O.C.S. po "behind, after," pozdu "late;" Lith. pas "at, by"), from PIE *po- (cf. Gk. apo "from," L. ab "away from"). Logical fallacy post hoc, ergo propter hoc is
L., lit. "after this, therefore because of this," attested from 1704. Post-bellum used in U.S. South from 1874 in ref. to Amer. Civil War; post-war first recorded 1908 in ref. to the Boer War.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
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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