From The Collaborative International Dictionary of English v.0.48:
Ouster \Oust"er\, n. [Prob. fr. the OF. infin. oster, used
substantively. See Oust.]
A putting out of possession; dispossession; disseizin; -- of
a person.
[1913 Webster]
Ouster of the freehold is effected by abatement,
intrusion, disseizin, discontinuance, or deforcement.
--Blackstone.
[1913 Webster]
2. Expulsion; ejection; as, his misbehavior caused his ouster
from the party; -- of a person, from a place or group.
[PJC]
Ouster le main. [Ouster + F. la main the hand, L. manus.]
(Law) 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. --Blackstone.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Dispossession \Dis`pos*ses"sion\, n. [Cf. F. d['e]possession.]
1. The act of putting out of possession; the state of being
dispossessed. --Bp. Hall.
[1913 Webster]
2. (Law) The putting out of possession, wrongfully or
otherwise, of one who is in possession of a freehold, no
matter in what title; -- called also ouster.
[1913 Webster]