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
< Latin, combining form representing post (adv. and preposition)
British Dictionary definitions for post-

post-

prefix
1.
after in time or sequence; following; subsequent: postgraduate
2.
behind; posterior to: postorbital
Word Origin
from Latin, from post after, behind
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-).

post- in Medicine

post- pref.

  1. After; later: postpartum.

  2. Behind; posterior to: postaxial.

post- in Science
post-  
A prefix that means "after," as in postoperative, after an operation, or "behind," as in postnasal, behind the nose or nasal passages.