a Greek, especially a member of the Achaean League.
5.
a member of one of the four main divisions of prehistoric Greeks, believed to have occupied the Peloponnesus and to have produced the Mycenaean culture.
1560-70; < LatinAchae(us) (< GreekAchaiós, perhaps reflected in Hittite Ahhiyawa, a country alluded to in records of the late 2nd millennium b.c.) + -an
British Dictionary definitions for Achaean
Achaean
/əˈkiːən/
noun
1.
a member of a principal Greek tribe in the Mycenaean era
2.
a native or inhabitant of the later Greek province of Achaea