| annexe(noun, adjunct) | |
| insert(noun, increase, extra, addition, supplement) | |
| amendment(noun, act, measure, qualification, provision) | |
| auxiliary(noun, addition, attachment, accompaniment) | |
| cast | |
| complement(noun, increase, extra, addition, attachment) | |
| rider(noun, act, increase, measure, extra) | |
| sequel(noun, increase, extra, addition, additive) | |
| addenda | |
| admixture | |
| enlargement(noun, increase, delay, development, extra) | |
| epilogue | |
| fixture(noun, accompaniment) | |
| reinforcement(noun, extra, supplement, appendage, adjunct) | |
| secondary(noun, accompaniment) | |
| supplementation | |
| accrual(noun, extra, supplement, appendage, add-on) | |
| additament | |
| additive(noun, increase, extra, addition, supplement) | |
| additum |
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| APA | Smart Define. (2015). addendum thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/addendum/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "addendum thesaurus" https://smartdefine.org/addendum/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, addendum thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/addendum/thesaurus/synonyms>. |
| MLA | Smart Define. "addendum thesaurus" 13 April 2015. Web. 21 September 2026. <https://smartdefine.org/addendum/thesaurus/synonyms> |