PS (also P.S. American English) /ˌpiː ˈes/ noun [countable]
[Language: Modern Latin; Origin: postscriptum; ⇒ postscript]
(postscript) a note written at the end of a letter, adding more information ⇒ PPS:
She added a PS to say ‘hi’ to my brother.
Best wishes, Julie. PS Maggie sends her love.

[TahlilGaran] Dictionary of Contemporary English ▲

PS
Postscript - written at the end of a letter when you want to add some extra information
After finishing the main part of the letter I wrote PS to include something very important that I had forgotten.

[TahlilGaran] English Idioms Dictionary ▲

PS
Please Sir 
Porn Star 
PostScript (Adobe Systems) 
PostScript (File Name Extension) 
Power Supply

[TahlilGaran] Acronyms and Abbreviations Dictionary ▲

PS9
PlayStation 9

[TahlilGaran] Acronyms and Abbreviations Dictionary ▲