What is the meaning of expulsion?

noun

• The act of forcing out someone or something.
  • usage: "the ejection of troublemakers by the police"; "the child's expulsion from school"
  • synonyms: ejection, exclusion, riddance
• Squeezing out by applying pressure.
  • usage: "an unexpected extrusion of toothpaste from the bottom of the tube"; "the expulsion of pus from the pimple"
  • synonyms: extrusion
• The act of expelling or projecting or ejecting.
  • synonyms: projection, ejection, forcing out