a seizure involving only a portion of the brain. seizure: uncontrollable convulsion, spasm, or series of jerking movements of the face, trunk, arms, or legs.
(also know as a "focal seizure") a seizure that occurs in a limited area in only one hemisphere of the brain. This type of seizure is more amenable to treatment with surgery than are generalized seizures.
A seizure is a way the body reacts to extra electrical action in the brain. When this action starts in a small part of the brain, it is called a partial seizure.