Definition of ousters:
(n) :
(now chiefly US) The forceful removal of a politician or regime from power; a coup; an ousting.
(v) :
To oust.
(n) :
(property law) Action by a cotenant that prevents another cotenant from enjoying the use of jointly owned property.
(n) :
(historical) A putting out of possession; dispossession; ejection.
(n) :
(UK) Someone who ousts.