The Collaborative International Dictionary of English v.0.48:

parapsychology \par`a*psy*chol"o*gy\ n.
   The field of study concerned with psychological phenomena not
   explainable by the laws of physics, especially extrasensory
   perception, telepathy, psychokinesis, precognition, and
   clairvoyance.

   Note: The field is controversial, most scientists holding the
         opinion that the supposed phenomena observed result
         from poor experimental design, or are mere statistical
         artifacts or in some cases deliberate fraud.
         [PJC]

WordNet (r) 3.0 (2006):

parapsychology
    n 1: phenomena that appear to contradict physical laws and
         suggest the possibility of causation by mental processes
         [syn: psychic phenomena, psychic phenomenon,
         parapsychology]