Something that is added or later to be added, e.g. a supplement to a book.
"I decided to add an addendum to my novel after I'd finished writing it."
by Brendan Sinclair December 28, 2005
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When something has had an addendum, it is said to be "addendumed"
John made an addendum to that article. He addendumed it.
by gerardb38 February 08, 2010
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An "afterthought" phrase that someone throws in at the end of a sentence to modify it into a more-polite statement.
A classic mannerly addendum is when someone hastily asks you to perform a certain task as he is rushing out the door, then pleasantly adds, "Please and thank you" after he's voiced his request.
by QuacksO October 26, 2018
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