noun (n)

• outward or visible aspect of a person or thing(noun.attribute)

  Synonym:
  visual aspect
  

  source: wordnet30
• the event of coming into sight(noun.event)

  Antonym:
  disappearance
  

  source: wordnet30
• formal attendance (in court or at a hearing) of a party in an action(noun.act)

  Synonym:
  appearing, coming into court
  

  source: wordnet30
• a mental representation(noun.cognition)

  Example:
  I tried to describe his appearance to the police.
  

  source: wordnet30
• the act of appearing in public view(noun.act)

  Example:
  The rookie made a brief appearance in the first period.
  It was Bernhardt's last appearance in America.
  

  Antonym:
  disappearance, disappearing
  

  source: wordnet30
• pretending that something is the case in order to make a good impression(noun.act)

  Example:
  They try to keep up appearances.
  

  Synonym:
  show
  

  source: wordnet30
• The act of appearing or coming into sight; the act of becoming visible to the eye; as, his sudden appearance surprised me.(noun)

  source: webster1913