Pronunciation: (os'tru-sīz"),[key] —v.t.,-cized, -ciz•ing. 1. to exclude, by general consent, from society, friendship, conversation, privileges, etc.: His friends ostracized him after his father's arrest. 2. to banish (a person) from his or her native country; expatriate.
3. (in ancient Greece) to banish (a citizen) temporarily by popular vote. Also,esp. Brit.,os'tra•cise".