the act of driving out or expelling: expulsion of air.
the state of being expelled: The prisoner's expulsion from society embittered him.

1350–1400; Middle English < Latin expulsiōn- (stem of expulsiō), equivalent to expuls(us) driven out (past participle of expellere to expel) + -iōn- -ion

nonexpulsion, noun
reexpulsion, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
expulsion (ɪkˈspʌlʃən)
the act of expelling or the fact or condition of being expelled
[C14: from Latin expulsiō a driving out, from expellere to expel]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1400, from L. expulsionem, from stem of expellere "drive out" (see expel).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Expulsion means a student is never permitted to return, while dismissal means a
  student may reapply after a specified period.
One big question raised by the new study is whether any life could survive
  expulsion from its planetary clan.
Many families had been abruptly separated during the chaos of expulsion.
Secrecy violators can be punished with fines, loss of seniority and even
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