addendum

[ uh-den-duh m ]

/ əˈdɛn dəm /

SEE MORE SYNONYMS FOR addendum ON THESAURUS.COM

noun, plural ad·den·da [uh-den-duh] /əˈdɛn də/ for 1, 2; ad·den·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.

Nearby words

added sixth, added title page, added-value tax, addend, addenda, addendum, adder, adder's-meat, adder's-mouth, adder's-tongue, adderall

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. 2019

Examples from the Web for addendum

When Sisley released a photo of the addendum, taken by a friend in the legislature, reporters flooded Biggs with questions.
Why Did America’s Only Pot Researcher Suddenly Get Fired?|Abby Haglage|July 10, 2014|DAILY BEAST
Hopefully you could include it as an addendum if not actually include it within the article itself.
Renounced Racist Derek Black Speaks Out|Caitlin Dickson|July 30, 2013|DAILY BEAST
That felt like cheating, I imagined my own reaction to reading a book and then finding such an addendum at the end.
Speak, Faulty Memory: Why Memoir Writing Is Harder Than You Think|Dave Bry|April 3, 2013|DAILY BEAST
Mike Brown had noted that the names of the women who were pregnant have an addendum, “and her unborn child.”
The Sept. 11 Survivor Tree in Bloom|Michael Daly|March 24, 2012|DAILY BEAST

An addendum to this story comes from the aforementioned “best friend” decorator, John Wiltgen.
The Real Grifter of Beverly Hills|Diane Dimond|September 15, 2011|DAILY BEAST
In his pocket was a bottle, carefully corked, empty save for a little roll of paper, which proved to be the addendum to the log.
Dracula|Bram Stoker
Natalenko re-read the addendum, pursed his thick lips and sighed.
Lone Star Planet|Henry Beam Piper and John Joseph McGuire
So, without apology, Webb offered an addendum to the conversation that had begun ten miles away.
Heart of the West|O. Henry
On the other hand the addendum to the book of Judges, chaps.
Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2|Various
This last arc defines the addendum of the escape-wheel teeth.
Watch and Clock Escapements|Anonymous

British Dictionary definitions for addendum

addendum

/ (əˈdɛndəm) /

noun plural -da (-də)

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

Word Origin for addendum

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