The Collaborative International Dictionary of English v.0.48:

Rectory \Rec"to*ry\ (-t?*r?), n.; pl. Rectories (-r?z). [Cf.
   OF. rectorie or rectorerie, LL. rectoria.]
   1. The province of a rector; a parish church, parsonage, or
      spiritual living, with all its rights, tithes, and glebes.
      [1913 Webster]

   2. A rector's mansion; a parsonage house.
      [1913 Webster]

WordNet (r) 3.0 (2006):

rectory
    n 1: an official residence provided by a church for its parson
         or vicar or rector [syn: parsonage, vicarage,
         rectory]