The Collaborative International Dictionary of English v.0.48:

mystique \mystique\ n.
   1. An aura of reverence or mystery stemming from feelings of
      high value or interest or meaning surrounding a person or
      thing; as, the Kennedy mystique.
      [WordNet 1.5]

   2. The aura of mystery surrounding the esoteric knowledge and
      skills required in certain occupations, or the power of
      those possessing those skills; as, the mystique of the
      astrophysicists.
      [PJC]

WordNet (r) 3.0 (2006):

mystique
    n 1: an aura of heightened value or interest or meaning
         surrounding a person or thing

Moby Thesaurus II by Grady Ward, 1.0:

69 Moby Thesaurus words for "mystique":
   assumption, attitude, aura, blaze of glory, brilliance, brilliancy,
   charisma, climate of opinion, common belief, community sentiment,
   conceit, concept, conception, conclusion, consensus gentium,
   consideration, cult, cultism, envelope, estimate, estimation,
   ethos, eye, feeling, general belief, glamour, glory, halo, idea,
   illustriousness, impression, inscrutability, ism, judgment, lights,
   luster, magic, mind, mystery, nimbus, notion, numinousness,
   observation, opinion, personal judgment, point of view,
   popular belief, position, posture, presumption, preternaturalism,
   prevailing belief, public belief, public opinion, radiance,
   reaction, resplendence, resplendency, sentiment, sight, splendor,
   stance, strangeness, supernaturalism, theory, thinking, thought,
   view, way of thinking