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adjective, noun.
adj. 1. of Achaia (a region and country in ancient Greece, in the Peloponnesus) or the Achaeans.
2. having to do with a league of cities formed in southern Greece in 280 B.C.
3. Greek.
noun 1. a native or inhabitant of Achaia.
2. (in Homer) any Greek. Also, Achaian, Achean.