What is the definition or description of: feeling faint?

Syncope: Faintness is a description of the initial manifestations of a syncopal spell where one loses consciousness for a few seconds usually. This is often due to drop in blood pressure, provoked by a noxious stimulus, but can be seen in dehydration. Initial general malaise, light-headedness, dizziness, contraction and darkening of vision, responding to recumbent posture. Otherwise loss of consciousnes.