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From The Collaborative International Dictionary of English v.0.48:
Ostracize \Os"tra*cize\, v. t. [imp. & p. p. Ostracized; p. pr. & vb. n. Ostracizing.] [Gr. 'ostraki`zein, fr. 'o`strakon a tile, a tablet used in voting, a shell; cf. 'o`streon oyster, 'oste`on bone. Cf. Osseous, Oyster.] 1. (Gr. Antiq.) To exile by ostracism; to banish by a popular vote, as at Athens. --Grote. [1913 Webster] 2. To banish from society, by a general consent; to exclude from social, political, or private favor; to exclude from conversation or friendship; to shun; as, he was ostracized by his former friends. A person may be ostracized by a formal vote or by a widespread but informal agreement. --Marvell. [1913 Webster +PJC]