What is Aliena Negotia Exaeto Officio Geruntur?

Legal Definition
The business of another is to be conducted with particular attention. Jones, Bailm. 83; First Nat Bank of Carlisle v. Graham, 79 Pa. 118, 21 Am. Rep. 49.
-- Black's Law Dictionary
Legal Definition
The business of another should be carried out with particular care.
-- Ballentine's Law Dictionary