Definition of Forthwith
Immediately; without delay; directly; within a reasonable time under the circumstances of the case; promptly and with reasonable dispatch. U. S. ex rel. Carter v. Jennings, D.C.Pa., 333 F.Supp. 1392, 1397. Within such time as to permit that which is to be done, to be done lawfully and according to the practical and ordinary course of things to be performed or accomplished. The first opportunity offered.
That's the definition of Forthwith in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.