Natural day
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
Properly the period of twenty-four hours from midnight to midnight.
Co. Litt. 135; Fox v. Abel, 2 Conn. 541; People v. Hatch, 33 111. 137.
Though sometimes taken to mean the "day-time" or time between sunrise and sunset In re Ten Hour Law, 24 R. I. 608, 54 Atl. 602, 61 L. R. A. 612.