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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.
An addendum is something that is added and made part of the original document only if it has been accepted by the concerned authorities. An Addendum is an informational or explanatory note of the requirements of the parties concerned that have not been specified in the original document.