13 entries under frontier topic. ×
| edge(noun, time, position, line, beginning) | |
| beginning(noun, action, start, borderline) | |
| border(noun, beginning, edge, borderline, boundary) | |
| borderline(noun, edge, border, transitional) | |
| line(noun, level, borderline) | |
| march | |
| boundary frontier(expression, borderline) | |
| marchland | |
| outpost | |
| pale | |
| perimeter(borderline, verge) | |
| sideline | |
| state line(expression, borderline) |
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| APA | Smart Define. (2015). threshold thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/threshold/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "threshold thesaurus" https://smartdefine.org/threshold/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, threshold thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/threshold/thesaurus/synonyms>. |
| MLA | Smart Define. "threshold thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/threshold/thesaurus/synonyms> |