What is Between?

Legal Definition
As a measure or indication of distance, this word has the effect of excluding the two termini Revere v. Leonard, 1 Mass. 93; State v. Godfrey, 12 Me. 366. See Morris & El In Co. v. Central R. Co., 31 N. J. Law, 212. If an act is to be done "between" two certain days, it must be performed before the commencement of the latter day. In computing the time in such a case, both the days named are to be excluded. Richardson v. Ford, 14 III. 333; Bunco v. Reed, 16 Barb. (N. Y.) 352. In case of a devise to A. and B. "between them," these word8 create a tenancy in common. Lashbrook v. Cock, 2 Men. 70.
-- Black's Law Dictionary