The Collaborative International Dictionary of English v.0.48:

Conjury \Con"ju*ry\, n.
   The practice of magic; enchantment. --Motley.
   [1913 Webster]

WordNet (r) 3.0 (2006):

conjury
    n 1: calling up a spirit or devil [syn: conjuring,
         conjuration, conjury, invocation]