1. an additional remark at the end of a letter, after the signature and usually marked by P.S.
2. something added to a completed work, such as a book or article

1. to add a postscript to

Examples

• She added a postscript to her letter mentioning the weather.
• P.S. Don’t forget to call me tomorrow.
• The author included a postscript explaining recent developments.
• He postscripted a note about the meeting time.
• The postscript contained important information about the deadline.
• I always read the postscript first in her letters.
• The book’s postscript discussed the historical context.