addenda

[uh-den-duh]
noun
1.
a plural of addendum.
2.
(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

addendum

[uh-den-duhm]
noun, plural addenda [uh-den-duh] , for 1, 2; addendums for 3.
1.
a thing to be added; an addition.
2.
an appendix to a book.
3.
Machinery.
a.
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.
b.
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. 2014.
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World English Dictionary
addendum (əˈdɛndəm)
 
n , pl -da
1.  something added; an addition
2.  a supplement or appendix to a book, magazine, etc
3.  the radial distance between the major and pitch cylinders of an external screw thread
4.  the radial distance between the pitch circle and tip of a gear tooth
 
[C18: from Latin, literally: a thing to be added, neuter gerundive of addere to add]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
With the war, these became footnotes, mere addenda to a suddenly monumental personality.
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