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a plural of .
(used with a singular verb) a list of things to be added:
The addenda in the back of the book runs to thirty pages.
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 .
Also called addendum circle. an imaginary circle touching the tips of the teeth on a gear.

Historical Examples

The book was probably a long time in the press, for there are no less than 20 pages of addenda in small print.
Darwin and Modern Science A.C. Seward and Others

Where then, it may be asked, are the addenda to be placed at the end of each century?
George Cruikshank’s Omnibus George Cruikshank

The volume has 738 pages: this is noticed because all the appendixes and addenda are comprehended in the same.
Bibliomania; or Book-Madness Thomas Frognall Dibdin

The addenda includes some good advice for the commercial grower.
The Gladiolus Matthew Crawford

The receipts will be found in the addenda, under the head of Hospital Diets.
Soyer’s Culinary Campaign Alexis Soyer

Latham in addenda to Opuscula, 392, 1860 (adds Cuchan to the group).
Indian Linguistic Families Of America, North Of Mexico John Wesley Powell

These addenda in the colonel’s own handwriting tickled Norton’s fancy.
Sons and Fathers Harry Stillwell Edwards

In addition to this allotted camp ration the prisoners possess the food sent in from abroad as addenda.
The Better Germany in War Time Harold Picton

Some less offensive mode might have been adopted, by the employment of errata, or appendices, or addenda.
Dealings with the Dead, Volume I (of 2) A Sexton of the Old School

In addition to the stories there is an addenda in which useful boy scout nature lore is given, all illustrated.
The Motor Maids at Sunrise Camp Katherine Stokes

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
n.

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.