Source : Webster's Revised Unabridged Dictionary (1913)

Fainting \Faint"ing\, n.
   Syncope, or loss of consciousness owing to a sudden arrest of
   the blood supply to the brain, the face becoming pallid, the
   respiration feeble, and the heat's beat weak.

   {Fainting fit}, a fainting or swoon; syncope. [Colloq.]