noun, plural addenda [uh-den-duh] , for 1, 2; addendums for 3.
a thing to be added; an addition.
an appendix to a book.
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.

1785–95; neuter singular of Latin addendus to be added, gerundive of addere to add 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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

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
Be sure to review current versions of all agreements, including any addendums or renewals.
Otherwise, the impression she gives with her addendums is that she is unsure whether her poems can stand alone.
Two addendums are part of the hospital disaster drill evaluation.
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