Post- means after
(v) - to write on something a date that comes after the real date

postgraduate (n) - a person who takes a college class after he or she has already graduated

posthumous (adj) - occurring or continuing after death; usually related to a book that is published after the author has died

postindustrial (n) - the time in society that came after the Industrial Revolution

postmark (n) - a mark printed across a stamp after it is received by the post office

postmeridian (adj) - taking place after noon; p.m.

postmortem (adj) - occurring or done after death; usually related to an examination of the body after it is dead

postpone (v) - to do something at a time or date after it was originally planned

postproduction (n) - the editing that is done after the movie, film, or video has been taped

postscript (n) - a comment, note, or thought written after the letter is finished; p.s.