noun (n)

• closure or blockage (as of a blood vessel)(noun.state)

  source: wordnet30
• (meteorology) a composite front when colder air surrounds a mass of warm air and forces it aloft(noun.phenomenon)

  Synonym:
  occluded front
  

  source: wordnet30
• (dentistry) the normal spatial relation of the teeth when the jaws are closed(noun.attribute)

  source: wordnet30
• an obstruction in a pipe or tube(noun.artifact)

  Synonym:
  block, blockage, closure, stop, stoppage
  

  source: wordnet30
• the act of blocking(noun.act)

  Synonym:
  blockage, closure
  

  source: wordnet30
• The act of occluding, or the state of being occluded.(noun)

  source: webster1913