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.