D defs.my
Entry 2 senses Webster, 1913

Ouster

/ous'-tẽr/ · Oust·er · IPA /ˈæɔstə/
01 n. A putting out of possession; dispossession; disseizin; -- of a person.
  1. 1.
    A putting out of possession; dispossession; disseizin; -- of a person.
    Ouster of the freehold is effected by abatement, intrusion, disseizin, discontinuance, or deforcement.” Blackstone.
  2. 2.
    Expulsion; ejection; as, his misbehavior caused his ouster from the party; -- of a person, from a place or group.
Phrases & compounds
Ouster le main — A delivery of lands out of the hands of a guardian, or out of the king's hands, or a judgement given for that purpose.