Source : Webster's Revised Unabridged Dictionary (1913)

Clairvoyant \Clair*voy"ant\, a. [F., fr. clair clear + voyant,
   p. pr. of voir to see. See {Clear}, and {Vision}.]
   Pertaining to clairvoyance; discerning objects while in a
   mesmeric state which are not present to the senses.

Clairvoyant \Clair*voy"ant\ n.
   One who is able, when in a mesmeric state, to discern objects
   not present to the senses.

Source : WordNet®

clairvoyant
     adj 1: perceiving things beyond the natural range of the senses
     2: foreseeing the future [syn: {precognitive}, {second-sighted}]
     n : someone who has the power of clairvoyance