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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 to a Real Estate Contract. Real Estate. Definition: An addendum to a real estate contract or purchase agreement is a document attached to and made a part of the original contract. It can be explanatory, informational or indicate other requirements of the parties that aren't clearly spelled out in the contract.