noun (n)

• a payment of part of a debt; usually paid at regular intervals(noun.possession)

  source: wordnet30
• a part of a broadcast serial(noun.communication)

  Synonym:
  episode, instalment
  

  source: wordnet30
• a part of a published serial(noun.communication)

  Synonym:
  instalment
  

  source: wordnet30
• the act of installing something (as equipment)(noun.act)

  Synonym:
  installation, installing, instalment
  

  source: wordnet30
• The act of installing; installation.(noun)

  source: webster1913