addendum

[uh-den-duhm]

noun

plural

addenda, addendums 

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.

   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

It was both reclamation and addendum, metaphors I carried into my future.

Read more on Los Angeles Times

A Department of Homeland Security lawyer who sat at a table near Diaz said that an addendum in Diaz’s arrest record in Texas acknowledged that he had DACA.

Read more on Los Angeles Times

His vocal addendum is a wax stamp finalizing the rough-hewn collection of distinct voices.”

Read more on Salon

One of the latest and most confounding of Trump’s plans is an addendum to his crippling tariffs.

Read more on Salon

In his marvelous history, “Americans and the California Dream,” Kevin Starr wrote that de Monfras made a secret addendum to his report to his government, with this quixotic plan for a Gallic takeover:

Read more on Los Angeles Times

Related Words

• appendix 
• postscript