After World War II.

A form of post-traumatic stress disorder that results from extended exposure to extreme trauma.

(countable) An addendum to a letter, added after the author's signature. / (countable) An addition to a story, play, etc. after its completion.

To extend (a letter or another document) with additional remarks.

(rare) A thing that has been written afterwards; something appended in writing.

plural of postscript

(US, sports) The period after the end of the normal sports season during which extra games are held (such as playoffs or championships).

(US) Of or pertaining to such a period.

plural of postseason

(education, US and Canada) Of or pertaining to education or educational institutions subsequent to secondary school or high school.