Noun ouster has 3 senses
  1. ouster, ejector - a person who ousts or supplants someone else
    --1 is a kind of person, individual, someone, somebody, mortal, human, soul
    Derived form: verb oust1
  2. ouster - a wrongful dispossession
    --2 is a kind of
    eviction, dispossession, legal ouster
  3. ouster, ousting - the act of ejecting someone or forcing them out
    --3 is a kind of ejection, exclusion, expulsion, riddance
    --3 has particulars: deposition, dethronement