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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 .
Also called addendum circle. an imaginary circle touching the tips of the teeth on a gear.

Contemporary Examples

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 28, 2013

Historical Examples

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 O. Henry

noun (pl) -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

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.


Read Also:

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  • Adder’s-mouth

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  • Adder’s-tongue

    a fern of the genus Ophioglossum, having one or sometimes two sterile leaves and a fruiting spike. any of several American dogtooth violets. noun any of several terrestrial ferns of the genus Ophioglossum, esp O. vulgatum, that grow in the N hemisphere and have a spore-bearing body that sticks out like a spike from the […]

  • Adder’s-meat

    noun the greater stitchwort See stitchwort

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