verb (used with object)
to expel or remove from a place or position occupied: The bouncer ousted the drunk; to oust the prime minister in the next election.
Law. to eject or evict; dispossess.

1375–1425; late Middle English < Anglo-French ouster to remove, Old French oster < Latin obstāre to stand in the way, oppose (ob- ob- + stāre to stand)

unousted, adjective

1. eject, banish, evict, dislodge.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
oust (aʊst)
1.  to force out of a position or place; supplant or expel
2.  property law to deprive (a person) of the possession of land
[C16: from Anglo-Norman ouster, from Latin obstāre to withstand, from ob- against + stāre to stand]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 15c., from Anglo-Fr. oster (late 13c.), O.Fr. oster "put out, keep off, remove, avert" (Fr. ôter), from L. obstare "stand opposite to, block, hinder," from ob "against" + stare "to stand," from PIE base *sta- "to stand" (see stet).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The city will vote on whether to oust the utility company and establish one
  that is more environmentally friendly.
But the many political enemies he has made will not be so forgiving and are
  determined to oust him.
Although there is no proven evidence that anyone involved sought to oust him,
  he has called the event an attempted coup.
Despite the view that neither will win the coming elections there is no
  momentum to oust either of them.
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