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ESSOIN, practice. An excuse which a party bound to be in court on a particular day, offers for not being there. 1 Sell. Pr. 4; Lee's Dict. h.t.
     2. Essoin day is the day on which the writ is returnable. It is considered for many purposes as the first day of the term. 1 T. R. 183. See 2 T. R. 16 n.; 4 Moore's R. 425. Vide Exoine.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.