Definition of addendum noun from the Oxford Advanced Learner's Dictionary

 

addendum

 noun
noun
BrE BrE//əˈdendəm//
 
; NAmE NAmE//əˈdendəm//
 
(pl. addenda
BrE BrE//əˈden//
 
; NAmE NAmE//əˈden//
 
)
(formal) Parts of a book
 
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a section of extra information that is added to something, especially to a book See related entries: Parts of a book Word Origin late 17th cent.: Latin, ‘that which is to be added’, gerundive of addere, from ad- ‘to’ + the base of dare ‘put’.
See the Oxford Advanced American Dictionary entry: addendum