| integration(numeration, mixing) | |
| involution | |
| joining(noun, capture, seizure) | |
| more | |
| notation | |
| over and above(verb, expression, idiom, phrasal verb, preposition) | |
| postscript(noun, increase, extra, supplement, additive) | |
| practice | |
| proliferation(noun, increase, rise, growth, surge) | |
| summing-up | |
| supplementation | |
| tally(noun, mark, total, average, points) | |
| totaling(noun, process, calculation, reckoning, adding) | |
| upsurge(noun, advance, increase, raise, rise) | |
| accord | |
| add | |
| accident | |
| acquirement(noun, gain, achievement, recovery, attainment) | |
| additum | |
| adjuvant |
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| APA | Smart Define. (2015). addition thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/addition/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "addition thesaurus" https://smartdefine.org/addition/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, addition thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/addition/thesaurus/synonyms>. |
| MLA | Smart Define. "addition thesaurus" 22 December 2015. Web. 23 September 2026. <https://smartdefine.org/addition/thesaurus/synonyms> |