Which of the following terms is used to denote a legally recognized failure to perform a duty?

The term that denotes a legally recognized failure to perform a duty is "breach of duty." In the context of legal and medical responsibilities, when an individual fails to meet the standard of care that is expected of them in their professional role, this constitutes a breach of duty. This failure can lead to legal consequences, especially if it results in harm to another person.

In different professional fields, a breach of duty implies that the responsible party did not act as a reasonably competent person would under similar circumstances. This concept is crucial in analyzing situations involving negligence and responsibility within the framework of legal accountability.

Understanding "duty to act" refers to the obligation to take action in certain situations, particularly in emergency scenarios, and is distinct from a failure to perform such duty. The term "deficiency" generally refers to a lack or inadequacy but does not specifically indicate a legal failure. "Malpractice" typically relates to professional negligence by a medical practitioner, encompassing broader aspects than just the failure to perform a duty. Therefore, "breach of duty" is the most precise term indicating a failure recognized by law.