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[uh-den-duh m] /əˈdɛn dəm/
noun, plural addenda
[uh-den-duh] /əˈdɛn də/ (Show IPA),
for 1, 2; addendums for 3.
a thing to be added; an addition.
an appendix to a book.
  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.
Origin of addendum
1785-95; neuter singular of Latin addendus to be added, gerundive of addere to add Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for addendum
  • When a new idea arises—such as an iPhone app—she makes an addendum to the existing contract.
  • It's not going to be an add-on or addendum.
  • It is exactly what its name implies: an addendum to the briefs for the convenience of the judges.
  • Go back to your office and finish reading the addendum to the lease agreement.
  • The announcement seemed a hastily added addendum to the original address.
  • Again, Carlton rushed back to the keyboard, adding an addendum to his just- finished epilogue.
  • This noteworthy addendum to Toscanini provides fresh insights, of interest to scholars and general music lovers alike.
  • Safraty said a rider, which will act as an addendum to a contract, will hopefully be adopted by the fall semester.
  • Their finding is worth noting as an addendum to your report.
  • Many vehicles now offer cameras as an addendum to their navigation systems.
British Dictionary definitions for addendum


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
Word Origin
C18: from Latin, literally: a thing to be added, neuter gerundive of addere to add
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for addendum

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.

Online Etymology Dictionary, © 2010 Douglas Harper
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