Source : Webster's Revised Unabridged Dictionary (1913)

Erastianism \E*ras"tian*ism\, n. (Eccl. Hist.)
   The principles of the Erastains.

Source : WordNet®

Erastianism
     n : the doctrine that the state is supreme over the church in
         ecclesiastical matters [syn: {Byzantinism}, {Caesaropapism}]