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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.
â¢ ADDENDUM (noun). The noun ADDENDUM has 1 sense: 1. textual matter that is added onto a publication; usually at the end. Familiarity information: ADDENDUM used as a noun is very rare.