1. adj. responsive to stimuli, changes in the environment, feelings, or other phenomena; that is, having sensitivity.

2. adj. having well-developed or intense affective sensibility.

3. n. in spiritualism and parapsychology, a person who is supposedly capable of receiving knowledge by paranormal means, as in clairvoyance and telepathy, or of perceiving auras and similar alleged phenomena beyond the range of normal perception. See also medium; psychic.