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1717, in the meaning defined above
Latin Achaemenius (adjective derivative of Achaemenēs) + -an entry 2 — more at achaemenid
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“Achaemenian.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Achaemenian. Accessed 25 May. 2020.
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