- 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.
Origin of addendum
1785–95; neuter singular of Latin addendus to be added, gerundive of addere to add
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for addendums
Overall, the plurality of voices—of young Helga and the author making revisions and addendums to the text decades later—mesh well.This Week’s Hot Reads: April 29, 2013
G. Clay Whittaker, Jen Vafidis
April 29, 2013
He knew how I hated a talkative person, and yet he stampedes into the conversation with his amendments and addendums of syntax.Heart of the West
- something added; an addition
- a supplement or appendix to a book, magazine, etc
- the radial distance between the major and pitch cylinders of an external screw thread
- 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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for addendums
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.
Online Etymology Dictionary, © 2010 Douglas Harper