Source : Webster's Revised Unabridged Dictionary (1913)

Achaean \A*ch[ae]"an\, Achaian \A*cha"ian\a. [L. Achaeus,
   Achaius; Gr. ?.]
   Of or pertaining to Achaia in Greece; also, Grecian. -- n. A
   native of Achaia; a Greek.

Source : WordNet®

Achaian
     n : a member of one of the four divisions of the prehistoric
         Greeks [syn: {Achaean}]