Interchangeably
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
By way of exchange or interchange. This term properly denotes the method of signing deeds, leases, contracts, etc., executed in duplicate, .where cach party signs the copy which he delivers to the other.
Roosevelt v. Smith, 17 Misc. Rep. 323, 40 N. Y. Supp. 381