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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.
addendum - textual matter that is added onto a publication; usually at the end. supplement, postscript. matter - written works (especially in books or magazines); he always took some reading matter with him on the plane. back matter, end matter - written matter following the main text of a book.