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1794, literally something added, from Latin addendum, neuter of addendus that which is to be added, gerundive of addere (see add (v.)). Classical plural form is addenda.
Summary. 1. An amendment means changes made in an already existing agreement. On the other hand, an addendum means including an additional document in the already existing one. 2. While an addendum becomes a part of the legal and binding contract, amendments are only part of a contract until negotiations. 3. An amendment can also be called as correcting a document, improving the document, making alteration or including supplementary information to the first document.