Synonyms|50Antonyms|4|Broader|0Narrower|0Related|18
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firstborn(noun, adjective, senior, older, elder)
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lower(senior, oldest)
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most senior(expression, adjective, lower, first, senior)
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of a former period(expression, adjective, idiom, lower, first)
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of an earlier time(expression, adjective, idiom, lower, first)
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oldest
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oldster(noun, senior)
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preceding(senior, oldest)
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prior(senior, oldest)
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top-level(adjective, older)
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APASmart Define. (2015). first-born thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/first-born/thesaurus/synonyms
ChicagoSmart Define. 2015. "first-born thesaurus" https://smartdefine.org/first-born/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, first-born thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/first-born/thesaurus/synonyms>.
MLASmart Define. "first-born thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/first-born/thesaurus/synonyms>