'P.S.' stands for 'postscriptum' — Latin for 'written after.' The afterthought committed to paper.
An additional remark at the end of a letter, after the signature, typically introduced by 'P.S.'; any addition or supplement appended to a completed work.
From Latin postscriptum (something written after), composed of post (after, behind, later in time) + scriptum (something written), the neuter past participle of scribere (to write), from PIE *sker- (to cut, to incise — writing originally being the cutting of marks into clay, wood, or stone). Latin post derives from PIE *apo- (away, off, behind), which also gives Greek apo- (away from) and English off. The scriptum element underlies an enormous English family: script, scripture, scribe, describe, prescribe
The P.S. was far more important in the age of handwritten letters, when you could not simply go back and insert a forgotten point into the body of the text. Once you had signed, your only option was to add a postscript below. Some of the most famous postscripts in history are more memorable than the letters themselves — Henry VIII reportedly added passionate postscripts to his love letters to Anne Boleyn.
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