noun (n)

• the act of being present (at a meeting or event etc.)(noun.act)

  Synonym:
  attending
  Antonym:
  nonattendance
  

  source: wordnet30
• the frequency with which a person is present(noun.time)

  Example:
  A student's attendance is an important factor in her grade.
  

  source: wordnet30
• the number of people that are present(noun.group)

  Example:
  Attendance was up by 50 per cent.
  

  source: wordnet30
• Attention; regard; careful application.(noun)

  source: webster1913