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From The Collaborative International Dictionary of English v.0.48:
Unseat \Un*seat"\, v. t. [1st pref. un- + seat.] [1913 Webster] 1. To throw from one's seat; to deprive of a seat. --Cowper. [1913 Webster] 2. Specifically, to deprive of the right to sit in a legislative body, as for fraud in election. --Macaulay. [1913 Webster] [1913 Webster]