Source : Webster's Revised Unabridged Dictionary (1913)

Postexilian \Post`ex*il"i*an\, Postexilic \Post`ex*il"ic\, a.]
   After the exile; specif. (Jewish Hist.), belonging to a
   period subsequent to the Babylonian captivity or exile (b. c.
   597 or about 586-about 537).

Source : WordNet®

postexilic
     adj : of or relating to the period in Jewish history after 539 BC
           (after the Babylonian Captivity)