Source : Webster's Revised Unabridged Dictionary (1913)

Abbacy \Ab"ba*cy\ ([a^]b"b[.a]*s[y^]), n.; pl. {Abbacies}
   (-s[i^]z). [L. abbatia, fr. abbas, abbatis, abbot. See
   {Abbey}.]
   The dignity, estate, or jurisdiction of an abbot.

Source : WordNet®

abbacy
     n : the jurisdiction or office of an abbot