Definition - occlusions

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occlusions
  1. an obstruction in a pipe or tube; "we had to call a plumber to clear out the blockage in the drainpipe"
  2. (dentistry) the normal spatial relation of the teeth when the jaws are closed
  3. (meteorology) a composite front when colder air surrounds a mass of warm air and forces it aloft
  4. closure or blockage (as of a blood vessel)
  5. the act of blocking