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A·chae·a(ə-kē′ə) also A·cha·ia (ə-kī′ə, -kā′-)
An ancient region of southern Greece occupying the northern part of the Peloponnesus on the Gulf of Corinth. The cities of the region banded together in the early third century bc to form the Achaean League, which defeated Sparta but was eventually beaten by the Romans, who annexed Achaea in 146 bc and later gave the name to a province that included all of Greece south of Thessaly.
1. (Placename) a department of Greece, in the N Peloponnese. Capital: Patras. Pop: 318 928 (2001). Area: 3209 sq km (1239 sq miles). Modern Greek name: Akhaïa
2. (Placename) a province of ancient Greece, in the N Peloponnese on the Gulf of Corinth: enlarged as a Roman province in 27 bc
an ancient district in S Greece, on the Gulf of Corinth.