IPA: //ˈpoʊstˌskrɪpt//
KK: /ˈpoʊstˌskrɪpt/
A note added at the end of a letter or document, usually after the signature, often introduced by 'PS'.
She added a postscript to her letter to remind him about the meeting.
Postscript → It is formed from "post-" (meaning after) and "scriptum" (meaning written). A postscript is something that is written after the main text, often added as an afterthought.
Think of something that is 'written' ('scriptum') 'after' ('post-') the main message — that's why a postscript is an addition to what has already been written.