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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.
Addenda vs addendums. An addendum is an additional item, usually to a document or book. Commonly it includes omissions or other missing material from the original. The dictionary lists addenda and addendums as recognized plural forms of this word. Addenda is the original Latin plural. However, addendum has been an established English word since the mid-sixteenth century, and as such has taken on the English plural of addendums. Advertisement.