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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.
Use addendum in a sentence. Show more usage examples... The old man had his lawyer add an addendum to his existing will to be sure that his grandchild would inherit 25% of his fortune, which would leave 75% to his two children. 11 people found this helpful.