noun
an additional remark at the end of a letter, after the signature
adjective
relating to or characteristic of a postscript
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The author added a postscript to the letter to clarify a few key points.
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Oh, by the way, there's a postscript at the end of the email with some extra details.
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I totally forgot to mention in the postscript that we're meeting at 7 instead of 6.
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As a postscript to our conversation, I wanted to say how much I appreciate your support.