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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.
a thing to be added; an addition. 2. an appendix to a book. 3. Machinery. the radial distance between the tip of a gear tooth and the pitch circle of a gear or the pitch line of a rack. Compare dedendum. Also called addendum circle. an imaginary circle touching the tips of the teeth on a gear.