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  1. In property law, the act of wrongfully excluding someone, especially a cotenant, from real property. Acts such as changing the locks, posting “no trespassing” signs, or physically denying a cotenant admittance to a piece of property are all considered ousters. (Ousters of a notorious an unequivocal nature are often prerequisites for adverse possession.)
  2. Unseating someone, especially a corporate or public official, from a position of power.
  3. An “ouster clause,” which is sometimes referred to as a “privative clause,” is a clause in a piece of legislation that limits or wholly precludes judicial review. Though not a feature of the American legal system, ouster clauses are a part of other common law legal systems, such as those in the United Kingdom and its former colonies.


[Last updated in August of 2020 by the Wex Definitions Team]