Magister Rerum Usus
Defined in 4 dictionaries — Cyclopedic (1922), Ballentine's (1916), Black's (1910), Stimson (1881)
The Cyclopedic Law Dictionary
Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
Use is the master of things. Co. Litt. 229b. Usage is a principal guide in practice. MAGISTER RERUM USUS; MAGISTRA rerum experlentia. Use is the master of things; experience is the mistress of things. Co. Litt. 69, 229; Wingate, Max. 752. MAGISTER SOCIETATIS (Lat.)
In civil law. Managing partner. Vicat; Calv, Lex. Especially used of an officer employed in the business of collecting revenues, who had power to call together the tything men (decumands), as it were a senate, and lay matters before them, and keep account of all receipts, etc._ He had, generally, an agent in the province, who was also sometimes called magister societatis. Id.; Story, Partn. i 95.
Ballentine's Law Dictionary
James A. Ballentine · 1916
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
Glossary of Technical Terms, Phrases, and Maxims of the Common Law
Frederic Jesup Stimson · 1881
I. Usage is the master of things [nsage determines]. Magister cancellariae: a master in chancery. Magister navis: the master of a ship.