| marginal(adjective, edge) | |
| peripheral(adjective, edge) | |
| rimming(adjective, edge) | |
| termination(noun, top, limit, extreme, edge) | |
| wall | |
| acme(noun, limit, edge) | |
| apex(noun, limit, edge) | |
| border line(noun, expression, idiom) | |
| circuit(noun, area, limit, scope, range) | |
| curb(noun, verb, edge) | |
| enclosure(noun, area, limit, scope, division) | |
| line of demarcation(noun, expression, idiom, limit, border) | |
| marches(noun, limit) | |
| maximum(noun, limit, edge) | |
| sharpness(noun, edge) | |
| zenith(noun, limit, edge) | |
| boundaries | |
| ceiling | |
| coast(noun, edge) | |
| crease |
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| APA | Smart Define. (2015). boundary thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/boundary/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "boundary thesaurus" https://smartdefine.org/boundary/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, boundary thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/boundary/thesaurus/synonyms>. |
| MLA | Smart Define. "boundary thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/boundary/thesaurus/synonyms> |