Achaea, Achaia, ancient region of the Peloponnesus, Greece + -an entry 1 — more at achaean entry 1
1607, in the meaning defined above
“Achaean.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Achaean. Accessed 9 Jun. 2026.
Britannica.com: Encyclopedia article about Achaean
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