noun (n)

• the act of beginning something new(noun.act)

  Synonym:
  debut, entry, first appearance, launching, unveiling
  

  source: wordnet30
• the first section of a communication(noun.communication)

  source: wordnet30
• formally making a person known to another or to the public(noun.communication)

  Synonym:
  intro, presentation
  

  source: wordnet30
• a basic or elementary instructional text(noun.communication)

  source: wordnet30
• a new proposal(noun.communication)

  Example:
  They resisted the introduction of impractical alternatives.
  

  source: wordnet30
• the act of putting one thing into another(noun.act)

  Synonym:
  insertion, intromission
  

  source: wordnet30
• the act of starting something for the first time; introducing something new(noun.act)

  Synonym:
  creation, foundation, founding, initiation, innovation, instauration, institution, origination
  

  source: wordnet30
• The act of introducing, or bringing to notice.(noun)

  source: webster1913