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addendum Antonyms
Opposite of addendum
Because the opposite of addendum shifts with each meaning, the antonyms and opposite words below are separated across 2 exact definitions and ranked by contrast strength.
• noun (Context 1)
An item of additional material, typically omissions or updates, added at the end of a book, contract, or other document.
Usage Example
"Both parties signed an omission to the original lease agreement to extend the rental period by six months."
Strong
omission
deletion
excision
• noun (Context 2)
In mechanical engineering, the radial distance from the pitch circle of a gear wheel to the outer tip of a tooth.
Usage Example
"The engineer carefully calculated the dedendum and dedendum to ensure the two gears would mesh smoothly without binding."
Strongest
dedendum
Similar words to addendum
Words similar to addendum shift depending on context. Common synonyms include:
appendix
supplement
postscript
codicil
addition
rider
annex
afterthought
Cite this Entry
Wordmom. (2026). Antonyms for Addendum. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/antonyms/addendum