Etymology
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expulsion (n.)

c. 1400, expulsioun, in medicine, "act of expelling matter from the body," from Old French expulsion or directly from Latin expulsionem (nominative expulsio), noun of action from past-participle stem of expellere "drive out" (see expel). From late 15c. as "forcible ejection, compulsory dismissal, banishment" as from a school or club.

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Definitions of expulsion

expulsion (n.)
the act of forcing out someone or something;
the child's expulsion from school
Synonyms: ejection / exclusion / riddance
expulsion (n.)
squeezing out by applying pressure;
the expulsion of pus from the pimple
Synonyms: extrusion
expulsion (n.)
the act of expelling or projecting or ejecting;
Synonyms: projection / ejection / forcing out
From wordnet.princeton.edu