Where does “post-postscript” come from?

post-postscript (English) comes from English post, from Middle French poste, from Italian posta, from Italian posto, from Latin positus, from Latin pōnō, from Proto-Italic poznō, from Proto-Italic pozinō.

post-postscript (English): An addendum added after a postscript

Definitions

  1. An addendum added after a postscript

Ancestry of “post-postscript”, step by step

post-postscript traces back through two separate lines of ancestry.

via English post

StepLanguageWordMeaning
1EnglishpostA long dowel or plank protruding from the ground;...
2Middle Frenchposte—
3Italianpostamail, post; post office; stakes
4Italianpostoplace, spot
5Latinpositusplaced; ordained
6Latinpōnōto place; to put; to lay
7Proto-Italicpoznō—
8Proto-Italicpozinō—
9Proto-Italicsinō—

via English postscript

StepLanguageWordMeaning
1EnglishpostscriptAn addendum to a letter, added after the author's...
2New Latinpostscriptumaccusative supine of postscrībō
3Latinpostscriptuswritten after
4LatinpostscriboI write after or under
5Latinscrībōto write
6Proto-Italicskreiβōto carve
7Proto-Indo-Europeanskreybʰ-to write
Every word from Proto-Italic sinō →Every word from Proto-Italic pozinō →Every word from Proto-Italic poznō →