Definition of addendum in English:

addendum

Syllabification: ad·den·dum
Pronunciation: /əˈdendəm
 
/

noun (plural addenda /-də/, addendums)

  • 2 Engineering The radial distance from the pitch circle of a cogwheel, worm wheel, etc., to the crests of the teeth or ridges. Compare with dedendum.

Origin

late 17th century: Latin, 'that which is to be added', gerundive of addere (see add).

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Pronunciation: məˈlôrd
noun
used to address an English nobleman