Addenda

[uh-den-duh]

Origin

noun

a plural of addendum.

(used with a singular verb) a list of things to be added: The addenda in the back of the book runs to thirty pages.

Dictionary.com Unabridged

noun, plural -da

[-duh] for 1, 2; -dums for 3.

a thing to be added; an addition.

an appendix to a book.

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.

Origin:
1785–95; neuter singular of Latin addendus to be added, gerundive of addere to add

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Etymonline

Word Origin & History

addendum

1794, "something added," from L. neut. of addendus "that which is to be added," gerundive of addere (see add). Plural form is addenda.

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