absence seizure

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A generalized seizure marked by transient loss of consciousness and the absence of convulsions, occurring mostly in children.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun medicine A type of seizure indicative of petit mal epilepsy. Brief seizure lasting up to 30 seconds involving vacantness and lack of awareness, possibly including twitching; not including spasm or unconsciousness.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the occurrence of an abrupt, transient loss or impairment of consciousness (which is not subsequently remembered), sometimes with light twitching, fluttering eyelids, etc.; common in petit mal epilepsy