noun (n)

• the act of forcing out someone or something(noun.act)

  Example:
  The child's expulsion from school.
  

  Synonym:
  ejection, exclusion, riddance
  

  source: wordnet30
• squeezing out by applying pressure(noun.act)

  Example:
  The expulsion of pus from the pimple.
  

  Synonym:
  extrusion
  

  source: wordnet30
• the act of expelling or projecting or ejecting(noun.act)

  Synonym:
  ejection, forcing out, projection
  

  source: wordnet30
• The act of expelling; a driving or forcing out; summary removal from membership, association, etc.(noun)

  source: webster1913