What is Alterum Non Laedere?

Legal Definition
Not to Injure another. This maxim, and two others, honeste vivere, and suum cuique tribuere, (qv.,) are considered by Justinian as fundamental principles upon which all the rules of law are based. Inst. 1, 1, 3.
-- Black's Law Dictionary
Legal Definition
Not to injure another.
-- Ballentine's Law Dictionary