The Collaborative International Dictionary of English v.0.48:

Preceptory \Pre*cep"to*ry\, n.; pl. Preceptories. [LL.
   praeceptoria an estate assigned to a preceptor, from L.
   praeceptor a commander, ruler, teacher, in LL., procurator,
   administrator among the Knights Templars. See Preceptor.]
   A religious house of the Knights Templars, subordinate to the
   temple or principal house of the order in London. See
   Commandery, n., 2.
   [1913 Webster]