noun (n)

• a narrowing that reduces the flow through a channel(noun.shape)

  Synonym:
  bottleneck, chokepoint
  

  source: wordnet30
• tight or narrow compression(noun.event)

  Synonym:
  coarctation
  

  source: wordnet30
• a tight feeling in some part of the body(noun.cognition)

  Example:
  He felt a constriction in her chest.
  Emotion caused a constriction of his throat.
  

  Synonym:
  tightness
  

  source: wordnet30
• the action or process of compressing(noun.act)

  source: wordnet30
• The act of constricting by means of some inherent power or by movement or change in the thing itself, as distinguished from compression.(noun)

  source: webster1913