Dictionary.net

A paragraph added to a letter after it is concluded and signed by the writer; an addition made to a book or composition after the main body of the work has been finished, containing something omitted, or something new occurring to the writer.

A paragraph added to a letter after the writer's signature; an addition to a book.

A part added to a letter after the signature: an addition to a book after it is finished.

Something added to a letter after it is signed; addition to a book.

n. [Latin] A paragraph added to a letter after it is concluded acid signed by the writer ; or any addition made to a book or composition after it had been supposed to be finished.