Triverbial Days
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
In the civll law. Juridical days; days allowed to the prætor for deciding causes; days on which the prætor might speak the three characteristic words of his office, viz., do, dico, addico.
Calvin.
Otherwise called "dies fasti." 3 Bl. Comm. 424, and note u.