[post.script] n [NL postscriptum, fr. L, neut. of postscriptus, pp. of postscribere to write after, fr. post- + scribere to write--more at scribe] (1551): a note or series of notes appended to a completed letter, article, or book
POSTSCRIPT
Meaning of POSTSCRIPT in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012