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

addendum

noun
 
/əˈdendəm/
 
/əˈdendəm/
(plural addenda
 
/əˈdendə/
 
/əˈdendə/
)
(formal)
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  1. a section of extra information that is added to something, especially to a bookTopics Literature and writingc2
    Word Originlate 17th cent.: Latin, ‘that which is to be added’, gerundive of addere, from ad- ‘to’ + the base of dare ‘put’.
See addendum in the Oxford Advanced American Dictionary
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adverb
 
 
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