A postscript (P.S.) is an afterthought, thought that's occurring after the letter has been written and signed. The term comes from the Latin post scriptum, an expression meaning "written after" (which may be interpreted in the sense of "that which comes after the writing").
A postscript may be a sentence, a paragraph, or occasionally many paragraphs added, often hastily and incidentally, after the signature of a letter or (sometimes) the main body of an essay or book. In a book or essay, a more carefully composed addition (e.g., for a second edition) is called an afterword. The word "postscript" has, poetically, been used to refer to any sort of addendum to some main work, even if it is not attached to a main work, as in Søren Kierkegaard's book titled Concluding Unscientific Postscript.
Sometimes, when additional points are made after the first postscript, abbreviations such as PSS (post-super-scriptum), PPS (postquam-post-scriptum or post-post-scriptum) and PPPS (post-post-post-scriptum), and so on, ad infinitum are used, though only PPS has somewhat common usage.
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- International Correspondence Schools; et al. (1905). English Grammar, Punctuation and Capitalization, Letter Writing. Scranton: National Textbook Company. §21 p. 33
- Sullivan, Robert Joseph (1877). Joyce, Patrick Weston (ed.). A dictionary of the English language. Dublin; Original from Peshawar University: Sullivan, Brothers; et al. pp. 317 & 509.
- Tanner, William Maddux (1922). Composition and Rhetoric. Original from the University of California: Ginn & Co. xxvii.
- "PS Slang Word Meaning - Expert answer Question". Expert answer Question. 2016-11-16. Retrieved 2016-11-16.