What is the meaning of absence?

noun

• The state of being absent.
  • usage: "he was surprised by the absence of any explanation"
• Failure to be present.
• The time interval during which something or somebody is away.
  • usage: "he visited during my absence"
• 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.
  • synonyms: absence seizure