A legal duty is the legal condition of a person whom the law. commands or forbids to do an act. The act may be called the. content of the duty; it is what must be described in defining any. particular duty.
Legal duty. n. the responsibility to others to act according to the law. Proving the duty (such as not to be negligent, to keep premises safe, or to drive within the speed limit) and then showing that the duty was breached are required elements of any lawsuit for damages due to negligence or intentional injuries.