a recurrent disorder of the nervous system, characterized by seizures of excessive brain activity which cause mental and physical dysfunction, as convulsions, unconsciousness, etc.
See epilepsy in American Heritage Dictionary 4
(ĕpˈə-lĕpˌsē)
nounpl.ep·i·lep·sies
Any of various neurological disorders characterized by sudden recurring attacks of motor, sensory, or psychic malfunction with or without loss of consciousness or convulsive seizures.