addendum

[ uh-den-duhm ]

noun

, plural ad·den·da [uh, -, den, -d, uh] ad·den·dums

1. a thing to be added; an addition.
2. an appendix to a book.
3. Machinery.
   1. 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.
   2. Also called addendum circle. an imaginary circle touching the tips of the teeth on a gear.

addendum

/ əˈdɛndəm /

noun

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

Word History and Origins

Origin of addendum¹

First recorded in 1785–95; neuter singular of Latin addendus “that which is to be added,” gerundive of addere “to add”; add

Word History and Origins

Origin of addendum¹

C18: from Latin, literally: a thing to be added, neuter gerundive of addere to add

Example Sentences

When Sisley released a photo of the addendum, taken by a friend in the legislature, reporters flooded Biggs with questions.

From The Daily Beast

One can only hope that he will not repeat this unfortunate addendum.

From The Daily Beast

Hopefully you could include it as an addendum if not actually include it within the article itself.

From The Daily Beast

That felt like cheating, I imagined my own reaction to reading a book and then finding such an addendum at the end.

From The Daily Beast

Mike Brown had noted that the names of the women who were pregnant have an addendum, “and her unborn child.”

From The 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.

From Project Gutenberg

And here, perchance, should the story end, for the after-history of Joachim Murat is a tragical addendum to that happy dnouement.

From Project Gutenberg

We must therefore regard Cibras as a mere addendum to, an extraneous element in, the tragedy, not as an integral part of it.

From Project Gutenberg

This was an addendum in "the colonel's own handwriting" and it closed with "pray for me."

From Project Gutenberg

This last arc defines the addendum of the escape-wheel teeth.

From Project Gutenberg

Related Words

• appendix
• postscript