Wordnet 3.0
NOUN (1)
1. 
 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; 
[syn: absence, absence seizure]
WordNet (r) 3.0 (2006):
absence seizure
    n 1: 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 [syn: absence, absence
         seizure]