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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.
addend on Wikipedia. Wikipedia; Verb . addend (third-person singular simple present addends, present participle addending, simple past and past participle addended) To furnish with an addendum. (organic chemistry) To furnish with an addend.