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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.
Definition of append. 1  transitive verb. 2  1 : attach, affix appended a diagram to the instructions. 3  2 : to add as a supplement or appendix (as in a book) notes appended to each chapter.