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

They’re really a visual addendum.”

From Los Angeles Times

At a public meeting Thursday, many LGBTQ+ park users expressed anger at the parks department and voiced opposition against a proposed addendum to Seattle Parks and Recreation policy that would designate “zones” in the area.

From Seattle Times

Other committee members, led by Republican Rep. John Black, voted to strip Kelly’s addendum on alleged obstruction from the official report.

From Seattle Times

Nickerson thinks that description needs an addendum: “A peacock with a honey badger attitude.”

From Seattle Times

The complaint was added as an addendum to a previous lawsuit against the National Park Service intended to stop the thinning of forests to prevent and lessen the severity of fires.

From Los Angeles Times

Related Words

• appendix
• postscript