52 entries under origin topic. ×
| heart(cause, source, root, mainspring) | |
| motive(cause, source) | |
| nub(cause, source) | |
| occasion(cause, source) | |
| pith(cause, source) | |
| reason(cause, source) | |
| starting place(expression, cause, source) | |
| stuff(cause, source) | |
| substance(cause, source) | |
| substratum(cause, quick, source, stem) | |
| underpinning(cause, quick, source, stem) | |
| well(cause, source) |
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| APA | Smart Define. (2015). radix thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/radix/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "radix thesaurus" https://smartdefine.org/radix/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, radix thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/radix/thesaurus/synonyms>. |
| MLA | Smart Define. "radix thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/radix/thesaurus/synonyms> |